"Just a few whiffs of a chemical found in male sweat is enough to raise levels of the stress hormone cortisol in heterosexual women, according to a new study by University of California, Berkeley, scientists.
Compared to their response when sniffing a control odor (yeast), the women who sniffed androstadienone reported an improved mood and significantly higher sexual arousal, while their physiological response, including blood pressure, heart rate and breathing, also increased. This was consistent with previous studies."
Valentine's Day is coming up, gentlemen. Tireless research at this university suggests that a romantic stroll during the day might be a good idea. Also consider dressing extra-warmly, playing the Wii, or worrying yourself up into a nervous, sweaty mess before your date arrives!