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, hentai porn at purpose-built locations such as sex clubs. In the gay pornography industry, which uses amateurs as well as professional momporn actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. Older names for a pornographic film include stag film, and blue movie. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Sigmund Freud considered foot binding as a form of fetishism. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. 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. The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Participants who exert sexual control over their partners are known as dominants or tops while participants who take the passive, receiving, or obedient role are known as submissives or bottoms. Pro-am pornography is sub-genre of amateur gay cock pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film.
