Pheromones area unit substances that area unit secreted to the surface by a private and received by a second individual of identical species. several examples exist in animals however their role in humans remains unsure since adults don't have any functioning vomer nasal organ, that processes secretion signals in animals. however pheromones are often detected by the sensory system though humans below develop and misjudge their smelling sense. Pheromones is also gift all told bodily secretions however most attention has been meshed toward axillary sweat that contains the odorous 16-androstenes. one among these steroidal compounds, androstadiene, is gift at abundant higher concentrations in male sweat and may be detected by girls, albeit with wide variation in sensitivity. Upper-lip application of a pharmacologic dose of androstadiene in girls leads to improved mood and heightened focus - notably to capture emotional data. A positive mood is thought to facilitate women’s sexual response, and multiplied focus improves sexual satisfaction. Indeed, some studies showed a useful result of androstadiene on concupiscence and arousal. However, these effects were addicted to the context of the experiment, for instance, on the presence of a male attendant. Pheromones may play a task in mate choice that is “dis assortative” concerning the human blood corpuscle matter (HLA)-genotype. Preliminary proof suggests that exposure to androstadiene in girls promotes attractiveness ratings of potential mates. last, some knowledge indicate that 16-androstene pheromones, especially androstadiene, play a useful role in women’s mood, focus and sexual response, and maybe conjointly in mate choice.