Women-only passenger cars are railway or subway cars intended for women only. They are a result of sexual segregation in some societies, but also can result from attempts to reduce sexual harassment and assault such as groping.

In a sexual context, groping is the act of intentionally touching another person in a sexual manner, usually without their consent. The term generally has a negative connotation in many societies, and the activity may be considered sexual assault or otherwise unacceptable. Touching a consenting person's body during sexual activity, a massage, or a medical examination is not usually considered groping, though the term is sometimes used to include clumsy, selfish, or inappropriate sexual touching. Areas of the body most frequently groped include the buttocks, breasts, vulva, thigh, penis, and scrotum. Gropers might use their hands, but pressing any part of their body against another person can be considered groping.