Andrew Pole had just started working as a statistician for Target in 2002, when two colleagues from the marketing department stopped by his desk to ask an odd question: “If we wanted to figure out if a customer is pregnant, even if she didn’t want us to know, can you do that?" ...

At which point someone asked an important question: How are women going to react when they figure out how much Target knows?

“If we send someone a catalog and say, ‘Congratulations on your first child!’ and they’ve never told us they’re pregnant, that’s going to make some people uncomfortable,” Pole told me. “We are very conservative about compliance with all privacy laws. But even if you’re following the law, you can do things where people get queasy.”

About a year after Pole created his pregnancy-prediction model, a man walked into a Target outside Minneapolis and demanded to see the manager. He was clutching coupons that had been sent to his daughter, and he was angry, according to an employee who participated in the conversation.

“My daughter got this in the mail!” he said. “She’s still in high school, and you’re sending her coupons for baby clothes and cribs? Are you trying to encourage her to get pregnant?”

The manager didn’t have any idea what the man was talking about. He looked at the mailer. Sure enough, it was addressed to the man’s daughter and contained advertisements for maternity clothing, nursery furniture and pictures of smiling infants. The manager apologized and then called a few days later to apologize again.

On the phone, though, the father was somewhat abashed. “I had a talk with my daughter,” he said. “It turns out there’s been some activities in my house I haven’t been completely aware of. She’s due in August. I owe you an apology.”

Labels: animal research, consumerism, culture, parenting

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Much of the attraction between the sexes is chemistry. New studies suggest that when women use hormonal contraceptives, such as birth-control pills, it disrupts some of these chemical signals, affecting their attractiveness to men and women's own preferences for romantic partners.

The type of man a woman is drawn to is known to change during her monthly cycle—when a woman is fertile, for instance, she might look for a man with more masculine features. Taking the pill or another type of hormonal contraceptive upends this natural dynamic, making less-masculine men seem more attractive, according to a small but growing body of evidence. The findings have led researchers to wonder about the implications for partner choice, relationship quality and even the health of the children produced by these partnerships.

Evolutionary psychologists and biologists have long been interested in factors that lead to people's choice of mates. One influential study in the 1990s, dubbed the T-shirt study, asked women about their attraction to members of the opposite sex by smelling the men's T-shirts. The findings showed that humans, like many other animals, transmit and recognize information pertinent to sexual attraction through chemical odors known as pheromones.

The study also showed that women seemed to prefer the scents of men whose immune systems were most different from the women's own immune-system genes known as MHC. The family of genes permit a person's body to recognize which bacteria are foreign invaders and to provide protection from those bugs. Evolutionarily, scientists believe, children should be healthier if their parents' MHC genes vary, because the offspring will be protected from more pathogens. ...

Both men's and women's preferences in mates shift when a woman is ovulating, the period when she is fertile, research has shown. Some studies have tracked women's responses to photos of different men, while other studies have interviewed women about their feelings for men over several weeks. Among the conclusions: When women are ovulating, they tend to be drawn to men with greater facial symmetry and more signals of masculinity, such as muscle tone, a more masculine voice and dominant behaviors. The women also seemed to be particularly attuned to MHC-gene diversity. From an evolutionary perspective, these signals are supposed to indicate that men are more fertile and have better genes to confer to offspring.

Women tend to exhibit subtle cues when they are ovulating, and men tend to find them more attractive at this time.

Labels: adultery, animal research, children, contraception, gender, gender differences, men, sex, women

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With Valentine's Day just around the corner, love is in the air. Or is it oxytocin? This so-called "love hormone" is involved in social bonding, and it always seems to get a publicity boost around Feb. 14. But research suggests that oxytocin isn't all roses and heart-shaped chocolates.

Oxytocin is marketed as an all-purpose "love drug" year-round. Online, sellers shill a product called "liquid trust" that purports to contain oxytocin and promises to create an "environment within which you are more attractive to people you previously had no luck with." In San Antonio, Texas, at least one doctor prescribes dissolvable oxytocin strips for husbands and wives going through rough patches, according to a Feb. 10 news report by local news station KENS5.

Even cultural and political commentators have touted oxytocin's effects, arguing that the hormone makes no-strings-attached sex impossible, especially for women.

"The way chemicals are released in the brain during intercourse is very different in men and women," Washington Post reporter Laura Sessions Stepp, the author of "Unhooked: How Young Women Pursue Sex, Delay Love and Lose at Both" (Riverhead Books, 2007), told Marie Claire magazine in 2007. "In women, oxytocin is released. It's a chemical that makes women want to nurture their young and stay close. Men get a huge jolt of testosterone, which suppresses oxytocin, and that's nature's way of saying, 'Leave the nest and go sire offspring somewhere else.' So when women think they can have sex and walk away just like guys do, they're having to suppress thousands of years of evolution that tells them to cuddle."

Not so fast. Sex may foster closeness, researchers say, but oxytocin shouldn't be blamed for bonding you forever to that guy you met at the bar last night. And the hormone isn't exactly going to make you a top salesman or irresistible lover. In fact, oxytocin is a complex chemical with a variety of influences on social behavior. It can increase trust among strangers — but it can also intensify negative memories of an aloof mother and even make you favor your "in-group" over people you perceive as outsiders.

"Oxytocin is not this indiscriminate love drug," Carsten K.W. de Dreu, a psychologist at the University of Amsterdam, told LiveScience.

Labels: animal research, committed relationships, culture, Fathers, men, motherhood, oxytocin, parenting, sex, women

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The fathers weren’t supposed to matter. But in the mid-1960s, pharmacologist Gladys Friedler was making all sorts of strange findings. She discovered that when she gave morphine to female rats, it altered the development of their future offspring — rat pups that hadn’t even been conceived yet. What’s more, even these rats’ grandchildren seemed to have problems. In an effort to understand the unexpected result, she made a fateful decision: She would see what happened when she put male rodents on the opiate. So she shot up the rat daddies with morphine, waited a few days, and then mated them with healthy, drug-free females. Their pups, to Friedler’s utter shock, were profoundly abnormal. They were underweight and chronic late bloomers, missing all their developmental landmarks. “It made no sense,” she recalls today. “I didn’t understand it.”

For the next several decades, Friedler tried to understand this finding, ultimately assembling a strong case that morphine, alcohol and other substances could prompt male rodents to father defective offspring. There was only one problem: No one believed her. Colleagues questioned her results — her former adviser urged her to abandon the research — and she struggled to find funding and get her results published. “It didn’t occur to me that you’re not supposed to look at fathers’ roles in birth defects,” Friedler says. “I initially was not aware of the resistance. I was one of the people who was actually naïve enough to work in this field.”

Over the last half-century, as scientists learned more and more about how women could safeguard their developing fetuses — skip the vodka, take your folate — few researchers even considered the possibility that men played a role in prenatal health. It would turn out to be a scientific oversight of significant proportions. A critical mass of research now demonstrates that environmental exposures — from paints to pesticides — can cause men to father children with all sorts of abnormalities. Drinking booze, smoking cigarettes, taking prescription medications and even just not eating a balanced diet can influence the health of men’s future kids. In the several decades since Friedler started her work, the idea that chemicals in a man’s environment can influence the health of his future children has, she says, “moved from lunatic fringe to cutting edge.”

So why don’t we ever hear about it? ...

“Why would we not look at the paternal side of the equation? To me that’s really a social and political puzzle,” says Cynthia R. Daniels, a political scientist at Rutgers who studies gender and reproductive politics. “We seem to politically be in a place where we overprotect and over-warn women, but where men and fathers remain almost completely invisible. You’re not likely anytime soon to see signs in bars that say, ‘Men who drink should not reproduce.’”

Labels: animal research, children, men, reproduction

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Recently, the psychologist David Buss's team at the University of Texas at Austin reported that men, when looking for one-night stands, check out women's bodies. Or as they put it, "men, but not women, have a condition-dependent adaptive proclivity to prioritize facial cues in long-term mating contexts, but shift their priorities toward bodily cues in short-term mating contexts."

Like many results in evolutionary psychology, this may seem blindingly obvious, but that does not stop it from being controversial. Earlier this month a neuroscientist in Britain, Gina Rippon, lambasted what she called the "neurohype" about sex differences: "There may be some very small differences between the genders, but the similarities are far, far greater."

She has a point. Compared with, say, chimpanzees, men and women are not very different. Most of the interesting things about people—language, laughter, love, laptops—come just as naturally to both sexes.

Yet we would be a very peculiar animal species if we did not have sex differences in behavior as well as anatomy. In virtually every mammal and nearly all birds, males are more aggressive, females more nurturing. It is a distinction that goes right back to active sperm competing for stationary eggs in the primeval ocean. It was only reinforced when the invention of the placenta and the mammary gland gave male mammals a gigantic prize to compete for: nine months and several years of somebody else's bodily efforts. Wombs are worth fighting over—and granting to favored applicants only.

So it's no zoological accident that in all societies, however peaceful or violent, men are about 50 times more likely to kill other men than women are to kill women, and they do so most in young adulthood, when most actively competing for mates. Likewise, it is no neurophysiological accident that women coo over newborn babies more enthusiastically than men do. Women who showed interest in babies left more genes behind than those who were indifferent; men who turned violent left more genes.

Labels: animal research, gender, gender differences, men, women

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Not long ago, Julia Fischer of the German Primate Center in Göttingen was amused to witness two of her distinguished male colleagues preening about a topic very different from the standard academic peacock points — papers published, grants secured, competitors made to look foolish.

“One of them said proudly, ‘I have three children,’ ” Dr. Fischer recalled. “The other one replied, ‘Well, I have four children.’

“Some men might talk about their Porsches,” she added. “These men were boasting about their number of children.” And while Dr. Fischer is reluctant to draw facile comparisons between humans and other primates, she couldn’t help thinking of her male Barbary macaques, for whom no display carries higher status, or is more likely to impress the other guys, than to strut around the neighborhood with an infant monkey in tow.

Reporting in the current issue of the journal Animal Behaviour, Dr. Fischer and her co-workers describe how male Barbary macaques use infants as “costly social tools” for the express purpose of bonding with other males and strengthening their social clout. Want to befriend the local potentate? Bring a baby. Need to reinforce an existing male-male alliance, or repair a frayed one? Don’t forget the baby.

It doesn’t matter if the infant is yours or not. Just so long as it has the downy black fur and wrinkly pinkish face that adult male macaques find impossible to resist. “They will hold up the infant like a holy thing, nuzzling it, chattering their teeth,” Dr. Fischer said. “It can be a bit bewildering to see.” ...

Why do males of some species attend to their offspring prolongedly, while others tend to spring off post-coitally? The reasons vary widely and are not always easy to discern.

Labels: animal research, Fathers

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The pregnancy was easy, the delivery a breeze. This was the couple’s first baby, and they were thrilled. But within two months, the bliss of new parenthood was shattered by postpartum depression.

A sad, familiar story. But this one had a twist: The patient who came to me for treatment was not the mother but her husband. ...

Up to 80 percent of women experience minor sadness — the so-called baby blues — after giving birth, and about 10 percent plummet into severe postpartum depression. But it turns out that men can also have postpartum depression, and its effects can be every bit as disruptive — not just on the father but on mother and child.

We don’t know the exact prevalence of male postpartum depression; studies have used different methods and diagnostic criteria. Dr. Paul G. Ramchandani, a psychiatrist at the University of Oxford in England who did a study based on 26,000 parents, reported in The Lancet in 2005 that 4 percent of fathers had clinically significant depressive symptoms within eight weeks of the birth of their children. But one thing is clear: It isn’t something most people, including physicians, have ever heard of.

Labels: animal research, Fathers, gender differences, men, mental health, pregnancy

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Conventional wisdom holds that two parents are better than one. Scientists are now finding that growing up without a father actually changes the way your brain develops.

German biologist Anna Katharina Braun and others are conducting research on animals that are typically raised by two parents, in the hopes of better understanding the impact on humans of being raised by a single parent. Dr. Braun's work focuses on degus, small rodents related to guinea pigs and chinchillas, because mother and father degus naturally raise their babies together.

When deprived of their father, the degu pups exhibit both short- and long-term changes in nerve-cell growth in different regions of the brain. Dr. Braun, director of the Institute of Biology at Otto von Guericke University in Magdeburg, and her colleagues are also looking at how these physical changes affect offspring behavior.

Their preliminary analysis indicates that fatherless degu pups exhibit more aggressive and impulsive behavior than pups raised by two parents.

Labels: animal research, Fathers, single parenting

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