Multiple men and women Bisexual pornography features one woman and two men who all perform sex acts on each other. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. Women that take on the roles of the giantess within this fetish often find the practice to be empowering and enjoy being worshiped. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. Reality pornography gay twinks is professionally made porn which seeks to emulate the style of amateur pornography. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. 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. 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. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Diaper fetishism is totally independent from pedophilia as the wearer derives pleasure only from the diaper and/or use of it. Its primary goal is sexual arousal in its audience. Internationally, hentai is a catch-all term to describe a genre of anime and manga hentai movies pornography. Buttocks are sometimes emphasized porn milf in pornography, where they are often referred to as booty. 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.