Exhibitionism

Exhibitionism is the act of exposing in a public or semi-public context those parts of one's body that are not normally exposed – specifically the genitals or buttocks of a man or woman, or the breasts of a woman. The practice may arise from a desire or compulsion to expose themselves in such a manner to groups of friends or acquaintances, or to strangers for their amusement or sexual satisfaction or to shock the bystander.