"Users of pheromones, but not of an inactive control substance, had increased frequency of informal dates, affectionate gestures, sleeping next to a romantic partner, foreplay, and sexual intercourse."

"Study finds proof that humans react to pheromones"

A gene that could explain how humans pick up powerful chemical signals called pheromones may have been pinpointed for the first time. The discovery promises to give scientists a new understanding of our basic instincts.

Odorless pheromones are secreted by many animals to attract mates. But they're also synthesized and marketed to consumers as potions to increase sexual attractiveness.