Scent of a woman's testosterone responses of men to women ovulation olfactory signals around the world spend billions of dollars every year in exotic-smelling perfumes and lotions in hopes of attracting a mate. However, going "au natural" may be the best way to capture the attention of a potential partner: men's shirts that smelled of women ovulate later had higher levels of testosterone than men who smelled shirts worn by women without ovulation, suggesting that testosterone …