Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. A lesbian is a female homosexual; a female who experiences romantic love or sexual attraction to other females. While wearing diapers, a diaper fetishist generally experiences a comforting feeling. A facial is a term for the sexual activity in which a man ejaculates semen onto the face of one or more sexual partners. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, big tit milf set up and precede sexual encounters. Unlike the usual power neutral relationships and play styles commonly followed by couples, activities and relationships within a BDSM context are often characterized by the participants taking on complementary, but unequal roles; thus, the idea of informed consent of both the partners becomes essential. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. 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. A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other. The mouth was the most common area to be ejaculated gay hentai upon. Lolita pornography caters to ephebophiles. On the other hand, the masochist enjoys being hurt, humiliated, or gay twinks suffering within the consensual scenario. Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics.