The role that pheromones play in sexual behavior is of great interest. Pheromones are biochemical substances that are secreted outside the body. Pheromones play an important role in human sexual behavior. In fact, pheromones are the very “body chemicals” that make people attracted to each other. Androstenol has been shown to be an odoriferous solid alcohol that remains in the armpits with human sweat. In one experiment, female volunteers slept overnight with a plastic tube necklace around their necks, which was stuffed with cotton strips soaked in Androsthenol and released through the opening to the outside. The next morning, it was notable that the women exposed to Androstenol were more inclined to communicate with men than those who did not smell the pheromones. A series of interesting experiments have demonstrated the effects of pheromones in the human menstrual cycle. In one experiment, a group of female volunteers were asked to expose themselves to secretions from women’s armpits collected at prescribed intervals during their menstrual cycle, and women who were more perceptive indicated important changes in their menstrual cycle. This suggests the existence of a well-known phenomenon of menstrual synchrony. If the influence of these pheromones on human sexuality is true, our “clean” society may be gradually destroying the sense of smell and thus allowing people to attack each other. Proper reproductive secretions (after some cleaning to remove bacteria) may be a sexual attractant. Ironically, “feminine hygiene” deodorants may just destroy the scent that “turns men on”.