The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Some consider the act to be gaysex as simple as fellatio mature milfs involving the scrotum. Jeffrey Masson has even argued that incest porn is the very nucleus of pornography — its prototypical form. Point of view pornography is adult entertainment filmed to look as if the watcher were experiencing the sex act themselves. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. A threesome is also depicted with one woman and two men who all perform sex acts on each other . Typically, its fans identify themselves as straight. Such documents have not been recognized as being legally binding, nor are they intended to be. Soft swinging is when a couple engages in sexual activities with only each other while other couples perform sex acts in the immediate vicinity. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics. Cum shots typically do not appear in girl-girl scenes and orgasm is normally implied by utterances, cinematic conventions, or body movement. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. Drama Hardcore showed this kind of film on its film. A heterosexual threesome may involve two men and a woman, or one man and two women - that is, two men having sex with a woman , or two hentai porn women with a man. 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. Rubber pornography involves rubber, latex, and similar materials. The resulting consent and understanding is occasionally summarized in a written contract, which is an agreement of what can and cannot take place.