Sadomasochism is practiced in isolation relatively rarely, though some masochists report biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed against it. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers, extreme body mod enthusiasts, animal players, latex or rubber aficionados, and others. Compensating elements of the total dominance and submission are care and devotion complementing one another, thus facilitating stable relationships. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. There may be more than two participants; both group sex and gang banging can be included. Women that take on the roles of the giantess within this fetish often find the practice to be empowering and enjoy being worshiped. As a result, little in history was documented to give an accurate description gay sex videos of how female homosexuality is expressed. Tentacle erotica can be consensual, but frequently contains elements of non-consensual sex. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games.