Couldnt happen. Up close enough, you can always tell. Funny you should mention smell, because even in the most convincing cases, the smell is usually a giveaway. The body chemistry cannot change, and they always smell like guys. If you don't notice the male odor, then it's the adam's apple, or the dude hands, or jaw, or the voice, or the lack of difference between hip and waist size. Usually it's multiple things.