The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Bobbi S. Targets the male audience, but is much less popular than Yaoi. Transsexual pornography features transwomen performers, who typically have male genitalia milf fuck and augmented female breasts . 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. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. 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. The term gaysex hentai is never used in this context in Japanese. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. This may relate to fetishes such as voyeurism or cuckolding. Gloryhole pornography features women performing fellatio on unidentified anime hentai men through a small hole made in a bathroom divider. Currently, animated television series aimed at adults are some of the most popular and critically acclaimed forms of entertainment. Insertion in pornography features women inserting various odd objects into their anus or vaginas. High heel pornography involves women or men dressed in high heeled shoes. Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings.