Those worn by ovulating women were the "most pleasant smelling" of the lot. The men were also asked to subjectively rate the T-shirts' smell. "Post-smell testosterone" was highest when men smelled a T-shirt worn by a woman on her presumed day of ovulation. Men who smelled the T-shirts of ovulating women had higher levels of testosterone than men who smelled shirts worn by non-ovulating women and control shirts that weren't worn by anyone. The researchers then collected the men's saliva to test their testosterone levels. The shirts were next placed in a freezer, until the male volunteers arrived.Įach man was tasked with smelling one T-shirt by sticking his nose in the bag and taking "three large inhalations" three times over the course of 15 minutes. A research assistant then sniffed the shirts to confirm that none smelled of extraneous odours. After three days, they returned them to the experimenters. (They got course credit and $10 for their trouble.)ĭuring the day, the women popped their shirts inside a sealed freezer bag. The women were even barred from having sex or sharing a bed. They were also asked to ditch smell-inducing foods such as garlic, vinegar and asparagus, as well as cigarettes, alcohol and drugs. If they wanted to bathe, they had to use unscented products. The women - none of whom were on the Pill - were prohibited from wearing perfume or antiperspirant. In the latest study, the researchers decided to map the connection between female ovulation and male testosterone by having women wear T-shirts three nights straight during various phases of their menstrual cycles - and getting men to sniff them. It has also been associated with competitiveness, dominance and risk-seeking, traits typically valued by women, particularly those at their reproductive peak. Higher testosterone, in turn, makes males more prone to initiate courtship.
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Odours emitted by females influence male testosterone levels, particularly during ovulation. Prior studies have shown that smells affect the hormones and subsequent mating habits of animals.
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The study, published last month in the journal Psychological Science, suggests that olfactory cues signalling a woman's ovulation - her most fertile time - can prime men to have sex with them. A man can smell when a woman is ovulating - and the proof is in his testosterone, says a new study from Florida State University that had undergraduate men sniffing sweaty T-shirts for course credit.