Shirley S. Wang looks at some studies of the hormonal influences on a woman’s body when she takes hormonal contraceptives:
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.
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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. Women try to look more attractive, perhaps by wearing tighter or more revealing clothing, says Martie Haselton, a communications and psychology professor at the University of California, Los Angeles. Research on this includes studies in which photos that showed women’s clothing choices at different times of the month were shown to groups of judges. Women also emit chemical signals that they are fertile; researchers have measured various body odors, says Dr. Haselton, who has a paper on men’s ability to detect ovulation coming out in the journal Current Directions in Psychological Science.
Such natural preferences get wiped out when the woman is on hormonal birth control, research has shown. Women on the pill no longer experience a greater desire for traditionally masculine men during ovulation. Their preference for partners who carry different immunities than they do also disappears. And men no longer exhibit shifting interest for women based on their menstrual cycle, perhaps because those cues signaling ovulation are no longer present, scientists say.
So, contrary to what the evidence of the bar scene might imply, women who use birth control pills are actually less likely to being picked up by the alpha male, as they each see the other subliminally as less appealing due to the hormonal shifts caused by the pill.
It’s not all good news for beta males, however. While they may have statistically greater chances of forming relationships with women who use hormonal birth control, once the woman stops using the pill, the natural attraction cycle starts again:
Researchers speculate that women with less-masculine partners may become less interested in their partner when they come off birth control, contributing to relationship dissatisfaction. And, if contraceptives are masking women’s natural ability to detect genetic diversity, then the children produced by parents who met when the woman was on the pill may be less genetically healthy, they suggest.
“We don’t have enough research to draw a firm conclusion yet,” says Dr. Haselton. “It is certainly possible that if women don’t experience that little uptick in [desiring] masculinity that they end up choosing less masculine partners,” she says.
That could prompt some women to stray, research suggests. Psychologist Steven Gangestad and his team at the University of New Mexico showed in a 2010 study that women with less-masculine partners reported an increased attraction for other men during their fertile phase. Women partnered with traditionally masculine partners didn’t have such urges, according to the study of 60 couples.
