In some scenes or relationships it may be impossible for consent to be hentai sex withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. The cover can have hinges or be a separate part. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Real medical shots or videos may violate privacy laws in some countries. 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. Typically featured are hitting, choking, name-calling and hair-pulling. Lolita pornography horny milfs features women who are 18 years old or slightly older, who pretend to be underage teen girls. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. A related term used in the genre is the term cougar, which implies an older woman as predator. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening gay fuck of Misty Beethoven. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises or other objects.