Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. Many cultures describe pain as an aphrodisiac. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. Breast fetishism is a paraphilic sexual interest focused on female breasts . Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. The term combines elements of the Freudian psychoanalytic fetish hentai sex and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism milf xxx and imperialism and their aftereffects. These styles are much closer to the style of bondage gay bear porn scenes in mainstream television. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage magazines. The cover can have hinges or be a separate part. Those with diaper-related paraphilias differ widely in their focus of attention. In Canada, Teletoon offers up its own Teletoon at Night programming block. The current public acceptance of celebrities with sex tapes is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly making their own tapes due to the prevalence of video cameras. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Typically featured are hitting, choking, name-calling and hair-pulling.