This yields a view that would not be obtainable directly through the eyes of a person while experiencing the sex act. In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. 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. Fisting pornography features the insertion of an entire hand into a performer vagina or anus. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. Pornographic films or sex films are films that present sexually explicit subject matter for the purpose of sexual arousal and erotic satisfaction of the viewer. Pegging is a recently invented word which features a woman penetrating a man with a strap-on dildo. A large part of the popularity of these videos is seeing how regular and normal the girls are in real-life. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts it into a second recipient mouth. With second wave feminism and growth of scholarship in women history and sexuality in the 20th century, the definition of lesbian broadened, sparking a debate about sexual desire as the major component to define what a lesbian is. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Going back milf porno at least as far as the Christy twins in the 1970s, depictions of incest and particularly incest between twins has been a feature of gay pornography. It may be used as foreplay, or as an alternative to sexual penetration. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands.