Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Other fetish gaysex Bareback pornography features performers who are not wearing condoms. If one person is penetrated by two objects, it is generically called double penetration . Works in this genre may be considered adult for any number of reasons. In 1988, a sex tape caused significant damage to Rob Lowe career. In S/M, the Sadist is usually the Top and the Masochist the Bottom, but these roles are frequently more complicated or jumbled . The term sadomasochism is derived from the words sadism and masochism . However, bisexual pornography is often placed near the gay section anime hentai in adult video stores, since many consumers are gay men. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. A sex party is a gathering at which sexual activity takes place. The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. Kurt Wild, who appeared as a bottom momsex in Lucas Entertainment Gigolos, is married to a woman and has three children. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect clitoral/G-spot stimulation in women, and associated sensory nerves .