First found hentai movies in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. Enema pornography involves adults given enemas to others, often fake. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. 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. The higher pay scale and profile within a production often leads to group scenes where a straight actor only tops. A sexual fetish may be regarded as an enhancing element to a romantic/sexual relationship achieved in ordinary ways or as a mental disorder/disorder of sexual preference if it causes significant psychosocial gaysex distress for the person or has detrimental effects on important areas of their life. Fantasies of group sex are extremely common among both men and women, and group horny milfs sex is a subgenre in pornographic films. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Especially popular in post-World War 2 Japanese culture. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. Squirt pornography involves women ejaculating. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . The related term twinkle-toes, which implies that a man is effeminate, tends to be used in a derogatory manner.