Frotteurism refers to a paraphilic interest in rubbing, usually one's pelvis or erect penis, against a non-consenting person for sexual gratification. It may involve touching any part of the body including the genital area. A person who practices frotteurism is known as a frotteur. 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 can be an early stage in child sexual abuse. This activity is often done in circumstances where the victim cannot easily respond, in a public place such as a crowded train or concert.

Usually, such nonconsensual sexual contact is viewed as a criminal offense: a form of sexual assault albeit often classified as a misdemeanor with minor legal penalties. Conviction may result in a sentence or psychiatric treatment.

The term frotteurism derives from the French verb frotter meaning "to rub". The term frotteur is the French noun literally meaning "rubber" or "one who rubs."

James Ferraro is an experimental musician born in Rochester NY, whose album Far Side Virtual was released by Hippos in Tanks in 2011. The album was chosen as Album of the Year by the UK's Wire Magazine. Ferraro has released material under a wide array of aliases, and was a member of the Californian two-piece band The Skaters. Ferraro has claimed that his initial dream was to become a soap opera star named "The James Ferraro ® Simulacra Company".