Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. A related term used in the genre is the term cougar, which implies an older woman as predator. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined. Many videos porno gay cultures describe pain as an aphrodisiac. Irrespective of the legal or social view of pornography, it has been used milf fuck in a number of contexts. Sigmund Freud considered hentai porn foot binding as a form of fetishism. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other. Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. The existence of such content in commercially available pornography is widely considered an urban legend. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Older names for a pornographic film include stag film, and blue movie. Its gain in prominence has been naked celebrities attributed to its depiction in the film Pecker, which was released in 1998. Two women tapegagged and cuffed to iron bars Bondage and Discipline are two aspects of BDSM that do not seem to relate to each other because of the type of activities involved, but they have conceptual similarities, and that is why they appear jointly.