The first film was released in 1980 starring Kay Parker. Sexual scenarios may involve male domination, female submission, hentai videos exhibitionism and erotic entertainment. Men and women may masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. The terms can be complimentary or pejorative. Such films continued to be produced but could only be distributed by underground channels. Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals . It may be used as foreplay, or as an alternative to sexual penetration. Enema pornography involves adults given enemas to others, often fake. Group sex can occur between people of all sexual orientations and genders. Boot fetishism is a sexual fetish dedicated to boots. Clothed female, momsex naked male is a genre of erotica featuring one or more nude men and one or more clothed women. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. Asian people or Asiatic people are people who descend from a portion of Asia population. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and videos gays many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably.