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Became synchronized through exposure to one another’s pheromones, those faint chemical signals released from the skin that control the mating rituals of much of the animal kingdom. McClintock has a new study, published in the February issue of nature Genetics, that makes an even more provocative link between sex and odor- specifically, the odor of a T shirt worn by a man on two consecutive days.

The experiment was simple. The T shirts were carefully prepared ( no cologne, no cigarettes, no sex) and then placed in boxes where they could be smelled but not seen. Forty-nine unmarried women were asked to sniff the boxes and choose which box they would prefer “ if they had to smell it all the time”

The results would have made Sigmund Freud proud. The women were attracted to the smell of the man who was genetically similar- but not too similar- to their dads. McClintock thinks there’s an evolutionary explanation. “mating with someone too similar might led to inbreeding” she says, Mating with someone different “ leads to the loss of desirable gene combinations.