Scent of a woman: Men's testosterone responses to olfactory ovulation cues

Women around the world spend billions of dollars each year on exotic smelling perfumes and lotions in the hopes of attracting a mate. However, going "au natural" may be the best way to capture a potential mate's attention: Men who smelled shirts of ovulating women subsequently had higher levels of testosterone than men who smelled shirts worn by non-ovulating women, suggesting that testosterone levels may be responsive to smells indicating when a woman is fertile.[...]