Making a pearl necklace is one of the activities that sex workers use as safe sex alternatives for people who refuse to wear condoms. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Fat fetishism also incorporates stuffing and padding, milf fuck whereas the focus of arousal is on the sensations and properties of a real or simulated gain. Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. 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. Pornographic films or sex films are films that present sexually explicit subject matter for the purpose of sexual arousal and erotic satisfaction of the viewer. Twink pornography features younger performers, and usually features hentai sex young men under 30 who identify as gay or bisexual. 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. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in the BDSM community or subculture is usually gay movies dependent on self-identification and shared experience. Reality Reality pornography refers to real or faked amateur encounters. Human urinal: An act common in the bondage sex community where a male or female slave will serve as a urinal for a dominant partner. Discipline often incorporates sadomasochistic aspects, though some sadomasochists distance themselves from D/s practices such as punishment.