摩擦癖，又称挤恋、挨擦癖（frottage，frotteurism），指在拥挤的场所故意摩擦他人，甚至用性器官碰撞他人的身体，并可伴有自慰等性刺激来达到性兴奋的人。

摩擦癖多见于男性，他们通常在人多拥挤的地方，例如在公共汽车上、在商店里等，用自己的生殖器去摩擦、挤压陌生人的身体，从中获得性满足。有的摩擦癖者在摩擦他人的身体时，不需要暴露自己的生殖器就能够得到快感与满足；而有的挨擦癖者则需要露出生殖器直接摩擦于他人的身体方可获得性的快感与满足。通常，摩擦癖者把摩擦的部位选择在他人的臀部，也有的人在他人身体的任何部位摩擦均可产生性兴奋。

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.