a derivative of testosterone also known as androsta-4,16,-dien-3-one, this endogenous steroid has been described as having potent pheromone-like activities in humans. This chemical component of male sweat (and semen) can influence not only women (improving mood, inducing ovulation) but also other men's behavior making them more cooperative. Androstadienone's odor can be described as vaguely musky, but it depends on the gene OR7D4 if it smells pleasant or repulsive.
