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. Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. Bobbi S. Celebrity sex tapes are amateur or professionally-made recordings of sex acts, as performed lesbian hentai by a celebrity and their partner. Pornography is often referred to as porn and a pornographic work as a porno. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Reality videos gays pornography is professionally made porn which momporn seeks to emulate the style of amateur pornography. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. Some techniques which may work for one individual can be difficult or uncomfortable for another.