Such ejaculation can be done by mammary intercourse, or masturbation over the other person, or result from the withdrawal of the penis from a partner mouth as he is ejaculating following fellatio, irrumatio, or intercourse. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. The primary subjects of pornographic depictions are pornographic gay bear porn models, who pose for still photographs, and pornographic actors or porn stars, who perform in pornographic films. The term comes from the French voyeur, one who looks. In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. Some people masturbate by using machines that simulate intercourse. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. They signal the presence of estrogen and the presence of sufficient fat stores for pregnancy and lactation. Exhibitionism: Becoming noticeably desperate or wetting oneself with the express purpose of being seen by strangers. Often other friends and community members may witness the signing of such a document in a ceremony, and so parties violating their agreement can result in loss of face, respect or status with their friends in the community. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. Ass to mouth is a slang term primarily used to describe the withdrawal of a penis from the receptive partner anus followed by the immediate insertion into the receptive partner mouth. Studies among BDSM practitioners in the US have shown that about half of all men find the idea of bondage to be erotic; many big tit milf women do as well. Biological anthropologist Helen B. In contrast, a celebrity may take hentai movies the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity.