Is That a Man or a Woman? Trust Your Nose
"Humans stink, and it's wonderful. A few whiffs of a pillow in the morning can revive memories of a lover."
Chemosensory Communication of Gender through Two Human Steroids in a Sexually Dimorphic Manner
"Recent studies have suggested the existence of human sex pheromones, with particular interest in two human steroids: androstadienone (androsta-4,16,-dien-3-one) and estratetraenol (estra-1,3,5(10),16-tetraen-3-ol)."
Sex pheromones may influence our perceptions of gender (Video)