According to the DSM-5, frotteuristic disorder involves intense fantasies, urges, and keen sexual arousal centering on the act of touching an unsuspecting and non-consenting person’s breasts, legs, buttocks, or genitals, or rubbing one’s own pelvic area or erect penis against that person, generally from behind. Frotteuristic behavior is repetitive and usually occurs in crowded public places, such as trains, buses, elevators, or even crowded streets. Aside from being a criminal activity because it is a form of nonconsensual sex, frotteurism is diagnosed as a mental health disorder when the behavior continues for more than six months, or when the fantasies and urges cause significant distress or dysfunction in personal relationships and daily activities.