Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Emetophilia pornography involving vomiting and gagging. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. This may help them develop their orgasm, increase its pleasure, and may inspire them to masturbate on a more frequent basis. They further argue that setting a discrete momsex line between safe and not-safe activities ideologically denies consenting adults the right to evaluate risks vs rewards for themselves; that some adults will be drawn to certain activities regardless gay hentai of the risk; and that BDSM play—particularly higher-risk play or edgeplay—should be treated with the same regard as extreme sports, with both respect and the demand that practitioners educate themselves and practice the higher-risk activities to decrease risk. Bondage/BDSM Bondage pornography features performers tied up or constrained gay movies in various ways. Advocates of RACK argue that SSC can hamper discussion of risk because no activity is truly safe, and that discussion of even low-risk possibilities is necessary for truly informed consent. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. A homosexual threesome would involve either three men or three women. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. Women that take on the roles of the giantess within this fetish often find the practice to be empowering and enjoy being worshiped. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms.