Masturbation is a form of autoeroticism involving self-stimulation of the genitals for sexual pleasure, often leading to orgasm. It can be done using hands, objects, sex toys, or, in rare cases, the mouth. Mutual masturbation occurs when partners stimulate themselves or each other.

Masturbation is common in both sexes and is considered a healthy part of sexual activity with no proven links to mental or physical disorders, except in rare cases like Peyronie's disease and hard flaccid syndrome. Historically depicted in art and literature, attitudes towards masturbation have evolved, with past religious and medical taboos declining over time. It is now widely discussed in media, though public masturbation remains illegal in most countries. Masturbation has also been observed in non-human animals.