Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. This is commonly called double anal or double stuffing. Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. Sadomasochism does not imply enjoyment through causing gay hentai or receiving pain in other situations . This is also the case in many relationships not considering themselves as sadomasochistic; gay cock it is considered to be a part of BDSM if it is practiced purposefully. RACK may be seen as focusing primarily upon awareness and informed consent, rather than accepted safe practices. Fisting pornography features the insertion of an entire hand into a performer vagina or anus. Arousal may be triggered by seeing the body movements or facial expressions of that person. In recent years, Japanese films of this genre have become more common in the USA and Europe although it still remains a small, fetish-oriented part of the adult film industry. For other scenes, particularly in established relationships, a safeword may be agreed to signify a warning rather than explicit withdrawal of consent; and a few choose not to use a safeword at all. In places where non-monogamous sex is taboo or illegal, group sex may take place in private or clandestine locations including homes, hotel rooms, or private clubs. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. Erotic spanking is the act of spanking another person for the nude milfs sexual arousal or gratification of either or both parties.