In psychiatry, frotteurism (commonly called toucherism) refers to a specific paraphilia which involves the non-consensual rubbing against another person to achieve sexual arousal. The contact is usually with the hands or the genitals and may involve touching any part of the body including the genital area. The majority of frotteurs are male and the majority of victims are female, although female on male, female on female, and male on male frotteurs exist. Adult on child frotteurism is a common early stage of child sexual abuse. This non-consensual activity may be done discreetly without being discovered, or in circumstances where the victim cannot respond, typically in a public place such as a crowded train, or at a rock concert. In common speech frotteurism is called groping though this term may sometimes be used for consensual Frottage. Usually such non-consensual sexual contact is viewed as criminal offense: a form of sexual assault albeit often classified as a misdemeanor with minor legal penalties. Conviction may result in a sentence including compulsory psychiatric treatment. A person who practices frotteurism is known as a frotteur.