In paranormal romance, typically it is the male who can smell the female’s arousal. But researchers have shown that it’s the chick who can detect the dude’s desire. From Fox News:
Chen and her colleagues asked 20 heterosexual guys to stop wearing deodorant and scented products for a few days.
Then they told the men to put small pads in their armpits as they watched pornographic videos and became aroused. (The researchers confirmed, using electrodes, that the images did the job.)
Later, the guys were asked to exchange those pads for fresh pads to collect the sweat they produced when they weren’t aroused.
Then the researchers recruited 19 brave women to smell the men’s pads while undergoing brain scans.
I hope those women were paid well.