structural:expansion, information:classification
Sexual rituals fall into two categories: culture-created, and natural behaviour, the human animal having developed sex rituals from evolutionary instincts for reproduction, which are then integrated into society, and elaborated to include aspects such as marriage rites, dances, etc. Sometimes sexual rituals are highly formalized and/or part of religious activity, as in the cases of hieros gamos, the hierodule, and Ordo Templi Orientis (O.T.O.).