A woman may not consciously think of a man's sweat during intimate moments. But her brain appears to recognize the scent and the significance of the emotions it conveys right away.
That's the conclusion of a Rice University study that exposed 19 twentysomething women to various scents, including "normal" sweat from males as well as so-called "sexual" sweat — more on this in a moment.
— From Unique male sweat has sexual message at The Houston Chronicle. See also: When you're in love, everything smells different.