For example, the Kama Sutra, in particular, goes into specific detail on how to properly strike a partner during sex. Am Abend , one of the earliest pornographic films that have been collected at the Kinsey Institute for Research in Sex, Gender, and Reproduction, starts with a female gay fuck masturbation scene. 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. Fisting may be performed with or without a partner. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Japanese rope bondage is distinguished hentai movies by its use of specific katas and aesthetic rules. Sloppy seconds is a slang phrase for when a man has sexual intercourse with another person who already has received another man penis in the relevant orifice and is therefore wet or sloppy. Can also include auto-fellatio, or performing oral sex on oneself. Strictly speaking, bondage means binding the partner by tying their appendages together; for example, by the use of handcuffs or by lashing their arms to an object. Enema pornography involves adults given enemas to others, often fake. It is distinguished from these concepts in that the cuckold thrill in their partner acts is specifically masochistic; as such it is considered a category of BDSM fetish. Facesitting is common among dominant and submissive individuals, for demonstrating superiority and for sexual gratification. The first pegging scene appears to have been in the non-pornographic 1970 film Myra Breckinridge, based on the novel of the same name by Gore Vidal, although it was not explicit. In general, softcore pornography is naked milf pornography that does not depict explicit sexual activity, sexual penetration or extreme fetishism.