Frictional metamorphosis

Friction, also known as frottage (frotteurism), refers to patients deliberately rubbing the opposite sex in crowded places, and even hit the female body with a sexual organ, and may be accompanied by ejaculation or masturbation to achieve sexual satisfaction. Friction is a sexual abnormality in which habituation and habituation gain sexual pleasure by touching or rubbing the opposite sex body. This type of sexual abnormality is mainly male, which is usually performed in crowded places, so it is also called crowding.