Of Women, Men and Testosterone
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I came of age in the late 60s and early 70s and the women’s movement was in full swing. Other men and I worked hard to ensure that future generations of women were treated equally and have the same rights and opportunities as their male counterparts. However, some of the earlier and more radical members of the moment believed that society should be genderless and that there were no differences between the sexes. While that notion was intellectually, emotionally and psychologically appealing, nobody can deny that there aren’t obvious, anatomical, hormonal and genetic differences between human males and females. Therefore, it should come as no surprise that women behave differently than men and visa versa (of course in biology there are always exceptions).
Over the years, researchers have determined that differences in female and male behavior can be attributed to a variety of things including physiological environmental, enculturative factors. Like it or not, behavioral differences between men and women have been ascribed to hormonal differences and fluctuations. For example, it is commonly accepted that higher levels of testosterone in men are thought to be responsible for male aggressive behavior whereas in women small amounts of testosterone enhance female libido. With this in mind, a new study published last week in PNAS suggests that testosterone may also play a role in a woman’s ability to trust or distrust others: most notably men.
The study was conducted by a group of Dutch researchers at the Utrecht University. Twenty-four women participated in the double-blind study over two days. On the first day, half of the women were given a dose of testosterone under their tongue, while the other received a placebo; the treatments were switched on the second day so that each participant experienced both treatments.
After the testosterone treatment, the researchers administered a facial trustworthiness task, in which each subject was shown a series of human faces and asked to assess how trustworthy the person in the image is. Economic exchange tasks, which are usually employed in similar experiments, were not used because of the possible confounding effects of testosterone on risk-taking and reward-seeking behavior. By administering mood tests and asking participants to guess which treatment they had received on either day, the researchers reduced the likelihood that either subjective preconceptions or mood changes may have affected the outcome.
The results of the study showed that women who received testosterone were less trusting than those who received the placebo. Moreover, the study revealed that “naturally distrustful” women were affected less by testosterone as compared with “more trusting” females where hormone-induced effects were the greatest. These findings led the researchers to postulate that the trust-reducing effect of testosterone may be adaptive and especially advantageous for less-socially aware women. For example, when competition is high and resources scarce, highly trusting women may be at greater risk for being cheated or taken advantage of and might benefit from a little jolt of testosterone-induced distrustfulness.
Interesting, female levels of testosterone have been observed to peak right around ovulation. Evolutionarily, it makes complete sense that a woman’s libido (remember testosterone stimulates this) would be highest at the time that she is most likely to conceive. However, the results from the Dutch study suggest that testosterone-induced distrustfulness may actually push potential mates away (and possibly explain why there are so many discerning women out there).
This led Nicholas Wade, the New York Times reporter who wrote a piece on the study to quip: “So guys, you knew women were complex, but it is even worse than you thought: at the moment you are most desired, you are least trusted.” Women—go figure!
Until next time.....
Good Luck and Good Hunting (for the few cavemen who still exist)
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