For example, in Australia it is rated Refused Classification . Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Terminology for roles varies widely within the various BDSM subcultures. 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. Reflective of its views on sexuality and culture, Japanese pornography delves into a wide spectrum of heterosexual, homosexual, and transgender sexual acts in addition to unique fetishes and philias. Double Stuffed , Double Vaginal , or Double Anal pornography involves the penetration of one orifice by two penises nude milfs or other objects. If dramatic skills are not involved, a performer in a porn film may also be called a model. Actual upskirt or downblouse shots may violate privacy laws in some countries. The concept of lesbian, young gay porn to differentiate women with a shared sexual orientation, hentai porn is a 20th-century construct. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating.