The Japanese sex industry uses the term Paizuri . Pornographic anime hentai films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt nude milfs to create. This is commonly called double anal or double stuffing. In some societies, the terms fox, plum, chick, or chicken are preferred. Foot fetishism, foot partialism, foot worship, or podophilia is a pronounced sexual interest in feet. A common way that these are depicted in a single scene is with one woman and two men performing together. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. This is also the case in many relationships not considering themselves as sadomasochistic; it is considered to be a part of BDSM if it is practiced purposefully. Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person anus, or anus and rectum, for sexual pleasure. Kinbaku is a Japanese style of bondage or BDSM which involves tying up the bottom using simple yet visually intricate patterns, usually with several pieces of thin rope . Well-known female porn stars who expressed their pleasure in pegging their male partners include Taylor Wane, Debi Diamond, Brittany Andrews, and Monique Covét. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. Arguably the gay bear porn most famous example of the genre is the Taboo series. RACK may be seen as focusing primarily upon awareness and informed consent, rather than accepted safe practices. 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 dependent on self-identification and shared experience.