frotteurism

thumb|150px|right|A sign outside of a bicycle parking lot in Chiba, Japan, warns "Beware of Chikan (body contact)|Chikan" Frotteurism is a paraphilic interest in rubbing, usually one's pelvic area or erect penis, against a non-consenting person for sexual pleasure. It may involve touching any part of the body, including the genital area. A person who practices frotteuristic acts is known as a frotteur.

Toucherism is sexual arousal based on grabbing or rubbing one's hands against an unexpecting (and non-consenting) person. It usually involves touching breasts, buttocks or genital areas, often while quickly walking across the victim's path. Some psychologists consider toucherism a manifestation of frotteurism, while others distinguish the two. In clinical medicine, treatment of frotteuristic disorder involves cognitive behavioral therapy coupled with the administration of an selective serotonin reuptake inhibitor.