Tag: do gentlemen really prefer blondes?

The “psych” in semen

Posted in news by jenapincott on March 25, 2009

hypnotize2My post on mind control properties in semen still attracts a disturbing amount of attention. So to appease your curiosity — and, I’ll admit it, mine — I’ve decided to do a little more investigation into the compounds in semen that may enter the bloodstream after sex. Some may have an indirect effect on the recipient’s hormones. A few may breach the blood-brain barrier, directly influencing mood and sex drive. Several, but not all, of the chemicals have been studied and proven to pass through the vaginal walls. From an evolutionary perspective, mood-modulating components in semen may give a woman an incentive to be in a committed relationship with regular, frequent sex. Apparently, the goo is bonding.

The information below comes from SUNY Albany evolutionary psychologists Gordon Gallup and Rebecca Burch, whose fascinating study on semen and depression I describe in BLONDES. Gallup and Burch wrote a chapter, “The psychobiology of human semen,” published in a compilation of research on sexuality. What they describe, I think, is fascinating.

The primary putative mind-altering ingredients in semen:

Luteinizing hormone: astounding concentration in semen; linked to high sperm count and motility. Absorption into female bloodstream may facilitate or even induce ovulation.

Prolactin: influences maternal behavior, oxytocin secretion; mediates bonding

Estrone and estradiol: assists in recipient’s absorption of other compounds such as progesterone; may boost woman’s sexual motivation and mood

Testosterone: may increase sex drive and motivation; the more intercourse, the higher the testosterone levels in women, and the stronger the sexual desire. More than half the amount of testosterone in sperm has been found to be absorbed by the vagina.

Cytokines: these are the “warriors,” they suppress immune reaction to semen invading the vagina and cervix and therefore increase likelihood of pregnancy

Enkephalins: these opioids may contribute to orgasmic experience. They may decrease anxiety and cause drowsiness after sex.  There’s also speculation that they assist in immune function and “reinforcing effects” — making a woman come back for more, i.e. addiction  (although the absorption rate in female bloodstream is unknown)

Oxytocin: assists in stimulation of ovulation, increases production of other hormones, initiates bonding, facilitates orgasmic contractions; may strengthen bonding and make sexual activity more rewarding

Placental proteins, including human chorionic gonadotrophin (hcg) and human placental lactogen: associated with sperm motility; may increase chances of pregnancy

Relaxin: made in the prostate, this hormone may facilitate fertilization, implantation, and uterine growth. The role of relaxin suggests that women should keep having a lot of sex during pregnancy because sperm has pregnancy-maintaining properties. Relaxin also facilitates implantation and prevents preterm labor.

Thyrotropin-releasing hormones: potential anti-depressive; works by stimulating the release of thyroid-stimulating hormone, which in turn triggers hormone production in the mood-mediating thyroid gland. In pill form, it’s used to treat PMS and depression.

Serotonin: increases sperm motility.  It also mediates mood, although not much known yet about vaginal absorption. Even if it doesn’t make it to the brain, it may indirectly alter behavior and emotions by contributing the building blocks of serotonin

Melatonin: increases effects of steroid hormones; induces sleepiness and fatigue, which may help the woman relax after sex; may stimulate reproductive function, also mood mediator; low melatonin levels are associated with depression and “reality disturbance”

Tyrosine: a precursor of neurotransmitters such as dopamine, the hormone of reward and addiction, and norepinephrine, involved in attention and arousal

Oh, and there’s also sperm in there, the DNA-bearing courier. Sperm is less than 3 percent the total volume of semen. But as it turns out, the bath water is nearly as important as the baby.

n.b. Although not yet studied, researchers suspect that these chemicals in semen may also enter the bloodstream through mucous membranes when having oral and anal sex. If so, straight women aren’t the only lucky recipients.

The case for why men don’t really prefer porn star bodies

Posted in media by jenapincott on March 22, 2009

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In BLONDES I discuss how tall, super-skinny hipless bodies aren’t as desirable to most men as many women think. The average catwalk strutter has a body mass index of 16.5 — skinny enough to be subfertile. Among other reasons why fashion models are long and wispy is that clothes appear more striking on them than on shorter, curvy women. The industry also happens to be dominated by gay men. Fair enough. But what about porn models? Wouldn’t those gals represent the male ideal of the female form?

The answer is not really, according to Eric Holland in the latest issue of Archives of Sexual Behavior. Responding to an earlier study on the measurements of successful porn actresses, Holland, who has become a public voice for the “red-blooded” straight male, made the following points:

1. Porn stars didn’t achieve success in their profession because they have optimal bodies. Holland points out that it’s wrong to assume that just because a woman represents the feminine “ideal” just because she has made it to the top as a porn actress. Her success is attributed to more than looks alone. It may be that those who make it to the top are willing to partake in more extreme acts with more enthusiasm.

2. Women who have many sex partners, or high sociosexuality, tend to have higher testosterone levels. [*] According to Holland, many porn stars have high-testosterone “masculinized” features, e.g. a higher waist-to-hip ratio (more tubular shape), flatter backside, and stronger and more prominent jawline. Men prefer a more feminine body type, says Holland. Breast implants, airbrushing, posing, and fancy filtered lights confuse the eye because they feminize an otherwise high-testosterone look. Holland claims many top porn stars have body types that, if seen pre-op and without light tricks, would strike us as surprisingly masculine. (Focusing on stars, he fails to address the legions of poorly-paid no-name actors with unambiguously feminine body types.)

3. Playboy centerfolds are more masculine because they’re picked by a man thought to be bisexual. Hugh Hefner, the magazine’s editor-in-chief (who has a strong role in the selection process) tends to choose women with more masculine features, especially stronger jawlines. (Hefner, in his bio, has admitted to having had gay sex.) Holland claims that Hefner’s tastes aren’t necessarily those of most straight men. Holland’s photo gallery of popular “masculinized” centerfold models is here.

4. Porn actress measurements are often unreliable anyway. The stats indicate that the median BMI of popular porn stars is 18.3, which is below the threshold of a healthy body weight, whereas some studies have found that men in western societies actually prefer a BMI more like 19.5-20.5 or higher. That said, Holland claims the measurements that accompany a centerfold’s photo might not always be a true reflection of her weight. Sizing up the centerfolds’ bodies, it appears they are heavier than reported. (I describe women’s WHR and BMI in some depth in the book.)

The interesting questions, some unanswerable: Do straight men agree with Holland? To what degree are men’s tastes influenced by porn? Would a guy subtly shift his sensibilities after seeing an erotization of androgenization? Are preferences context-specific — e.g., in porn, are hard tubular bodies and fake oversized breasts hot, whereas in wives they’re not? To what extent does race matter? What does it take to be a porn star, and is there really an implicit selection process that favors more “masculinized women”? Given the range of men’s erotic tastes, which surely involve more than beauty, is Holland’s hypothesis even testable?

Only one thing is clear here: When it comes to women’s bodies, many have much to say, but there’s no clear arbiter of taste. Nor should there be.

* A reader wrote to ask for a study that supports Holland’s assertion that high testosterone in women is associated with having more sex partners. Here’s one (sorry, full-text version for subscribers only).

Straight guys: Do you agree with Holland’s points?

Viagra for flaccid….fannies?

Posted in news by jenapincott on March 20, 2009

SPL31781_003Yesterday’s glimpse of springtime reminded me that bikini season is nigh, and with it the dread of cellulite thighs. Cellulite — likened to orange peels, cottage cheese, and pillow-top mattresses — is caused by stretched-out fat cells. Unable to hold their shape as they bulge out, these fatty deposits stipple the skin.

What to do?

Look for answers from the country that’s almost all coastline. Croatian doctor Karmela Altabas and her colleagues recently published a provocative hypothesis in my favorite journal, Medical Hypotheses. Cellulite, they say, might be be cured by sildenafil citrate, aka Viagra.

Thus far, Viagra has been useful to women indirectly — the drug aids and abets male arousal, keeping a a lover erect far longer than nature would allow. Basically, it triggers a chemical process that relaxes the smooth muscles of the penile artery. Turgid with blood, the penis stays erect until the drug wears off. (It doesn’t work on women because female arousal, desire, and orgasm are more complicated.)

According to the researchers, cellulite bulges are like flaccid penises — they’re both caused by weak blood flow. Viagra may solve the problem. The same chemical reaction that opens the phallic valves may also improve “microcirculation” under the skin, increasing blood flow and keeping cell membranes taut. Just as erectile tissue becomes smooth and tight, so, hopefully, would the butt and thighs. Moreover, high doses of sildenafil citrate has been shown to kill fat cells in cultures.

Altabas and her colleagues predict a topical form of sildenafil citrate within a few years — a cream, perhaps. To penetrate the skin, application would be followed by iontophoresis, a tiny electric charge. Smear and zap — perfect thighs! But how long would the magic last? If it’s any measure, a Viagra-fueled erection can last four hours — or one afternoon of sex on the beach.

Why make your lover write about you?

Posted in news by jenapincott on March 15, 2009

1481 Let go and explore your very deepest emotions and thoughts about your relationship. That’s what psychologists James Pennebaker and Richard Slatcher told their study subjects to do, in a journal or diary, for twenty minutes a day. The participants — University of Texas at Austin undergrads — were in long-term relationships, but temptation, hormones, and stress are known to take their toll on young love. Slatcher and Pennebaker had a theory that writing about a lover could make love last longer.

The psychologists weren’t interested in what the subjects wrote about their girlfriends or boyfriends. Those writings were kept private. But another set of daily correspondence was fair game: instant messages (IM). Under the premise of a word quantification procedure, participants were asked to forward all instant message (IM) chats between themselves and their partners. Because IMs are frequent, impromptu, and real-time, they’re precious in the world of psychological studies. The researchers wanted to know if expressive journal writing on a daily basis made a difference in a couple’s everyday interactions. The frequency and emotional content of IM conversations, they figured, reflect the state of the relationship.

It turns out that men and women required to write privately about their feelings do communicate more with their loved ones. Comparing the instant messages of the 44 subjects assigned to express their feelings in writing on a daily basis versus the 42 who did not, the researchers found that the diary writers were more expressive with their partners. Without realizing it, men and women who had previously reflected on their relationship in writing used more emotion words such as happy, love, nervous, and mad when they IM’d their partners. Three months into the study, 77 percent of the participants who had written about their relationship were still with their partners, compared to 52 percent of the participants in the control group.

Why does daily journaling about a relationship help so much? According to the researchers, it helps lovers to better articulate their feelings. And in so doing, it also helps to reinforce those feelings. Thoughts and feelings are so often vague and fleeting; capturing them in words amplifies them and loops them back to you. Our brains love patterns — mulling over emotions helps reify them, makes them concrete. You may find yourself expressing yourself with your partner the same way you do in your private writing. Focus on positive thoughts in your journal writing and you may find that those happy emotions spill over into everyday life. In a virtuous cycle, the partners of the study participants also became more expressive as well. (It’s another amplifying feedback loop, not unlike how having a lot of sex may make you want even more of it.)

Take a moment and reflect: How expressive are you with your partner? To what extent are you on autopilot, filling your conversations with practicalities instead of emotion? Can you commit your feelings to words? If you can, you may find yourself more committed to your relationship.

DIY Pheromones!

Posted in news by jenapincott on March 11, 2009

morty In BLONDES I describe how pheromones such as androstenone and hormones such as oxytocin have been found to influence mood and possibly attraction — but the effects are subtle and context-dependent.

Several readers saw the text box in which I mention the DIY-ers who are concocting their own pheromones (so-called -mones or pheros) in basement labs, or ordering commercial formulas online, and trying them on in social situations such as on the subway or a first date. No shock: most of the dabblers are guys. Some suffer from social anxiety and a gaping suspension of disbelief. (But insatiable curiosity is always an acceptable excuse.) Others are women, sometimes lovelorn girlfriends seeking to jumpstart a sputtering sex life or recapture the magic of the first few months of a love affair. To these idealists, the chemical route to a person’s heart is more compelling than the psychological. If only there were really such a thing as a love potion.

“How do I find these forums?” eager readers have asked. Here are a few links below — some are interesting observations, others analyze sprays and so on. There’s no harm in dabbling with dab-ons, I believe. Make-your-own-mones! Find-your-own-pheros! As long as you don’t take it too seriously.

Many of the pheromones discussed are related to androstenone (male scent) and copulins (female scent) and the hormone oxytocin. Wearers experiment to get the right amount and type of chemical that match their own body chemistry. (The book describes the actual pheromone studies in some detail.) There is real scientific evidence that sweat-derived chemicals have a moderate effect in some situations. But these underground Boyles and Curies have their own approach, totally unburdened by the scientific method:


The Pheromone Information Library

In the confusing world of pheromone retailers telling their customers whatever they want to hear to get them to buy their products, the Pheromone Information Library provides unbiased and accurate information written by existing users of pheromones.

Love-Scent Forum
Discussion of pheromones and other topics related to the science of attraction
A few interesting threads:
The pheromone help list (dosing, technique, experiences, philosophy, etc.)
Sweat the secret to making pheromone sprays work?
Getting an ex-boyfriend back

Pherotalk
Advice, tips & tricks for chemical DIY-ers as well as good old-fashioned advice on basic interpersonal relations. Members share their formulaic faves
A few interesting threads:
The Snook’s big book o’ pheros for rookies
[Research] Vagina lovers: Who can best describe the aroma at its most attractive?
What works: Intimacy/Long Term Relationships (& sex, sex/sensual “enhancers”)
Kitty’s Curious Combos (aka MixMistress)

Basenotes
Discusses pheromones along with commercial fragrances

Drugs-Forum
Drugs-forum strives to be a information hub of high standards and a platform where people can freely discuss recreational drugs in a mature manner.

Oxytocin Forum
Oxytocin is the pair bonding hormone that creates a feeling of trust, bonding and love within mammals. This forum explores whether it works as a spray.

Not to detract from the fun, but do take all these anecdotes with a healthy dab o’ doubt. A recent study led by biologist Craig Roberts suggests that, sure, spray-ons work. Women judged men wearing a special male scent as more attractive. Funny enough, they also thought the fragrance-wearing men were more attractive when watching them in a video where they could not be smelled. In still pictures, however, fragrance wearers were no more attractive than men who didn’t wear fragrance. It turns out it’s not the chemical that makes men more attractive. It’s their mien and bearing — the confidence they got from believing it works.
Then again, maybe they hadn’t yet struck that perfect pheromonal chord.

A Q&A about Do Gentlemen Really Prefer Blondes?

Posted in media by jenapincott on March 8, 2009

raised_hands1

It’s a lazy Sunday afternoon, so I thought I’d post my answers to a few questions about Do Gentlemen Really Prefer Blondes? posed by readers.


Do Gentlemen Really Prefer Blondes? is full of research that really digs deep into people’s dating behaviors. It’s almost impossible for anyone to read this book and not be shocked by at least a few findings. While conducting your research for the book, what is one finding that shocked you?




It’s hard to choose; there’s a lot of shocking science behind sex and attraction! One of my favorite weird findings is that women, when most likely to conceive, have an unconscious bias in favor of socially and/or physically dominant men. Very masculine faces, bodies, behaviors, scents… these qualities are more attractive to women in the five-day window leading up to ovulation. Another study found that a chemical found in the sweat of high-testosterone men may hasten the release of a woman’s egg, thereby increasing the chances of pregnancy.
 When not fertile, many women prefer kinder, gentler, more cuddly types who are more likely to make good long-term partners. These are just a couple examples of how the “body” hijacks the brain when it comes to mating.

To what extent does biology play a part in our dating behaviors? Is it out of our control who we’re attracted to?



We’ve all met people with whom we’d love to fall in love, but something’s off or something ‘s missing — we call it lack of chemistry. Truth is, genes, hormones, and instincts influence our dating lives in ways we might not even be aware of or fully understand. I think these biological biases vary from person to person. For instance, hormonal effects may be stronger in some people than in others and weaken with age — teens and twenty-somethings are likely the most hormonally motivated. Some men may have genes that are associated with commitment problems, as some recent studies have shown. Other genes have been found to influence body odor smells that in turn influence attraction. Personality is also a factor — for example, studies have found, unsurprisingly, that extroverts generally have more lovers than introverts.

But we’re not slaves to biology. Our love lives are also influenced by culture and personal experience. Nature AND nurture.

 


gentlemen1

In the book you talk about how women often choose different men for long-term relationships than for short-term, and that the emphasis is on sex appeal in short-term relationships. Does that mean we settle for less in marriage ? Could that be a reason why many marriages fail or people cheat? Can we not obtain the best of both worlds–someone who we are very much attracted to and will also make a life partner?

Speaking for myself — and just about everyone I know — yes, we want the best of all worlds in a life partner. (In fact, a study has shown that the more attractive the woman, the more she insists on “having it all.”) That is, we want to strike all three chords: physical, emotional, and mental attraction. But it’s not easy! One reason marriages fail is that there’s no harmonious balance. A year into a marriage, the wife realizes she has no physical chemistry with her brilliant husband, or the husband realizes his gorgeous wife is emotionally unavailable. Many people feel they must make tradeoffs in a long-term relationship — and perhaps that’s realistic — but you’ve got to do some soul-searching first. What do you value most at this phase of your life? Looking ahead, what are the chances you’re going to want to stay together? And if you’re the type who has commitment problems — for some, there may even be a biological basis — should you even get married in the first place?


Your book appeals to women, but men also find it interesting. What’s your advice to single guys on the prowl for Ms. Right

?

Guys should know that many women “mate copy”; that is, we unconsciously prefer guys who have already attracted attractive women. To that end, women may be more attracted to a guy if he has managed to charm other women. But it’s a delicate balance. I, for one, would be attracted to a witty, funny guy who makes other women laugh — but not if he’s a player or comes across as too slick. 
As I describe in the book, body language is also a crucial part of attraction. Guys, be aware of what you do with your body. Women much prefer men who make eye contact (don’t approach a woman without doing this several times, and don’t stare). Gestures such as throwing your arm around the adjacent chair or clasping a buddy’s shoulder suggest confidence and dominance. Mirroring your date’s body language suggests attraction and may make her more attracted to you in turn.




So, what would you like to say to all those blonde wannabes out there?

Why not experiment with blond hair dye or blond highlights? Brightness, rarity, youthfulness….that constitutes much of the appeal of the blonde. Or wear something bright, youthful, and rare — that also catches the eye.

Why breaking up is easier than you think

Posted in news by jenapincott on March 5, 2009

breakup1A friend of mine is thinking of breaking up with her boyfriend. He forgot their one-year anniversary last week. He also kicked her dog and insulted her sister. Utterly mediocre, she calls the relationship. But break-ups are painful. She wonders if she could bear it.

Should she keep him or cut him loose?

The answer is cut, if you take to heart a popular study led by researcher Paul Eastwick and his colleagues at Northwestern and Carnegie Mellon Universities. The psychologists recruited undergrad couples and asked them about the strength of their relationships, how they think they’d deal with a break-up, and for how long they think they’d be upset. Not surprisingly, many lovers thought they’d be crushed.

But the heart is a fickle thing. By the end of the nine-month study, about one-third of the love affairs crashed and burned. And as the lovelorn healed, Eastwick and team evaluated how they coped.

What the psychologists discovered is this: The heart is hardier than you imagine. Newly single men and women were significantly happier than they predicted in the days, weeks, and months after their break-up. This was even true of lovebirds who didn’t think they’d rebound so quickly. Sure, there were tears and pain. But they all recovered quickly and more easily than they thought they would. The people who were most inaccurate at predicting their feelings — and were happily surprised by their own recovery — were those who said they had been very much in love and had not initiated the break-up.

Granted, it’s possible that breaking up is easier for people in their twenties. Healing from multi-year relationships likely takes a lot longer than a few months. But there’s a lesson here for us all, according to the researchers. Facing the prospect of a loss, we overestimate our future distress. Psychologists call this an “impact bias.”

Impact bias research, popularized by Harvard psychologist Daniel Gilbert and his colleagues at Carnegie Mellon and Princeton, has been gaining a lot of traction in the last few years. According to these experts, we’re all terrible at predicting the emotional consequences of things that happen to us. Like fools, we’re too often shocked when it turns out that good things — winning the lottery, buying a dream house, or getting the trophy wife — aren’t as good as we think they’ll be, at least not in the long-term. But bad things — breaking up, getting laid off, or advancing into a recession — aren’t as bad as we think either. After the initial trauma, we snap back to our emotional baselines faster than we think.

Applied to our love lives, the big break-up blowout seems worse than a slow attenuation of affection. But the truth is that we often overestimate the pain of blowouts and underestimate the pain of drawn-outs. That’s why, for some of us, it takes years to break up — even when a relationship is abusive or too tired or troubled to fix. As discussed in BLONDES, the impact bias is a self-protection measure. From an evolutionary perspective, It gives us hope and drive. It helps us value what we have, and can prevent us from being impetuous and destructive. (As a result, we’ll probably take love-preserving drugs in the future.) The downside is that we sometimes stymie and sabotage ourselves out of fear of losing something that has less value than we think. (A plausible argument for fall-out-of-love drugs.)

Tapping into this wisdom, I told my friend that in the long-term she won’t regret leaving a man she doesn’t love enough. Don’t settle for suboptimal. Like removing a band-aid, a break-up may be more painful when done slowly than quickly. And healing, however broken the heart, may happen faster than you think.

Men prefer…Mom’s lips and chin

Posted in news by jenapincott on March 3, 2009

mccainwomen533For long-term relationships, like often seeks like. Pretty Woman fantasies aside, husbands and wives tend to have similar socioeconomic status, education level and intelligence, and religious background.

It turns out they also tend to look alike — or at least choose mates who resemble their opposite-sex parent. As described in BLONDES, studies have found that women go for men who resemble their fathers ( unless they don’t like their dads) and men go for women with certain features of their moms. Freud called this sexual imprinting. Evolutionary psychologists call it assortative mating, meaning that people look for long-term mates with the ideal balance of genes that are like and unlike their own.

And the evidence is mounting. Another study has confirmed that people do pick partners that look significantly like their opposite-sex parent (but not the same-sex parent) when compared to the general population. Psychologist Tamas Bereczkei and his colleagues at the University of Pecs in Hungary measured fourteen facial proportions — the width, height, and length of eyes, noses, jaws, and other features — of more hundreds of couples, their partners, and parents. [*]

And here’s the interesting part: men and women home in on particular parent-resembling features. It’s not necessarily the whole face that counts.

Men pay attention to the lower half of a woman’s face. That is, a guy’s partner is likely to have his mom’s proportions of lip fullness/width, mouth width/face width, jaw length/face length, and jaw width/face width. They also go for an overall facial shape that is similar to their mother’s.

Women, meanwhile, zero in on the center of men’s faces. A gal’s partner is likely to have her dad’s proportions of mouth-brow distance/face height, distance between pupils/face width, eye width/face width, eye width/face width, distance between the inner eye corners/face width, nose length/face height, and nose width/face width.

bradangelind_468x5404Why is it that men go for Mom’s jaw and mouth while women go for Dad’s nose, eyes, and cheekbones? The researchers speculate that it has to do with how men and women process visual information differently. Women pay attention to center of men’s faces because those features are distinctive and stable over time. Facial hair may come and go, but eyes, noses, and cheeks stay the same. Men by default pay most attention to the lower half of the face because that region is most sensitive to sex hormones. Lip fullness, jaw size, and overall facial shape are cues of estrogen and testosterone levels.

Of course, Dad’s nose and Mom’s lips might not be considered optimally attractive. But for long-term relationships, lust is just one part of the equation. Everything in proportion…

* A kind reader brought to my attention an article reporting that Bereckzei’s study, published in Proceedings of the Royal Society B, was recently retracted. Another scientist noticed discrepancies in the data that, for instance, found a correlation of 92.8 percent between the jaw width of a man’s mother and his mate. Bereckzei admitted that an error was made, but that the results are still very strong (a 70 percent correlation in jaw width) after he fixed the errors. It will be interesting to see if the paper is republished after the data are re-crunched.

Why Tiger Woods lost

Posted in news by jenapincott on February 26, 2009

tiger-woods-son-240x320 For the past eight months before today’s loss in the World Golf Championships- Accenture Match, champion Tiger Woods had been recovering from a knee injury. He told several reporters that he enjoyed the time spent at home. More than ever before, he got to hang out with his pregnant wife, Elin, and their two-year-old daughter Sam Alexis. Earlier this month Elin gave birth to a son, Charlie Axel.

Tiger’s ignominious loss today could be attributed to the possibility that he’s out of practice. Maybe his knee was still acting up (although he said it felt fine). Perhaps he hasn’t been getting enough sleep, or he had an off day. But there’s another theory: it’s hormonal. It could well be that Tiger’s testosterone levels are down.

That would certainly be the case if Tiger Woods is like the many loving husbands and dads participating in studies by medical anthropologist Peter Gray at the University of Nevada. As discussed in BLONDES, studies have shown that men’s testosterone levels take a nosedive when they’re in serious, committed relationships. Spending time at home in the comfort of a loving relationship can do the trick.

When a child is born, a dad’s circulating testosterone may be at an all-time low. Gray and his colleagues have seen this effect in dads all over the world. Lower testosterone levels make a man less aggressive, less focused and competitive — and more agreeable and responsive. Even holding a baby doll can make expectant father’s testosterone levels plummet. If Tiger’s T-levels are lower, it’s good news for his newborn son but bad news for his game. From an evolutionary perspective, newborn Charlie Axel is manipulating Tiger’s hormone levels so he’ll be a better dad.

Of course, little does Mother Nature know that when Dad’s a professional athlete, it’s best to leave his hormones well enough alone.

Why do teens get zits?

Posted in news by jenapincott on February 24, 2009

acne If there’s any proof that youth is overrated, it’s zits — red oozing pustules of them, whiteheads and blackheads, all over the face and neck, from ages twelve up to twenty.

Acne vulgaris came up during my interview about BLONDES on Michio Kaku’s show, Science Fantastic. Does acne play a role in sexual selection? My hunch is that it does, and today I found some support while skimming the annals of Medical Hypotheses.

The evolutionary theory behind acne, according to the article by Dale Bloom, is that it plays a role in mate selection. Fact is, pimples are as repulsive as they are conspicuous. They suggest disease and trigger a “disgust” reflex. At the expense off a teen’s self-esteem, they signal “stay away from me sexually.” Those big red spots are stop signs.

The reason ? To delay pregnancy. Think about it: Pubescent people don’t make the best parents. Women who recently got their first period have bodies and brains unprepared for pregnancy and childbirth. Even in ancestral times, pregnancy put very young women at an extreme disadvantage, compromising their health and that of their babies. With the baby diverting precious gluteofemoral fat, adolescent mothers may inadvertently arrest their own physical and mental development. And it goes without saying that teen boys are unfit fathers — in fact, the prefrontal cortex doesn’t even fully develop until a guy’s early twenties. Case in point is Alfie, the tiny, squeaky, grim-looking Gameboy-playing 13-year-old British boy who became a dad earlier this month. (Curiously, Alfie appears too young to have pimples yet, and his girlfriend’s face is as smooth as porcelain.)

Are pimples Nature’s way of steering away potential mates until a young person has reached true reproductive maturity? Bloom thinks so, calling them a “high-order psychoneuroimmune interaction,” the body protecting itself by becoming temporarily unattractive when it is most vulnerable. It’s an interesting idea. I, for one, had so many pimples in junior high that I wasn’t at risk for even a kiss. So do teen pregnancy rates coincide with Stridex sales? Do flawless girls get knocked up more often than pimply ones? If so, perhaps dermatologists should start prescribing birth control.

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