Горячая линия / Hot line: Generally, interest differs between people, and gender depends on sexual orientation. 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. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Others may also use vibrators and other sexual devices more commonly associated with female masturbation. Such films continued to be produced but could only be distributed by underground channels. Going back 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. Clothed female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred xxx milf to by the term breeding or the reverse money shot. Group sex is sexual behavior involving more than two participants. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Arousal may be triggered by seeing the body movements or facial expressions of that person. The stigma of being gay or labeled as such has steadily eroded since the Stonewall riots began the modern American gay rights movement in 1969. When all regions of the face are included, facial cum shots comprise approximately 62% of scenes where external ejaculation occurs. It may be used as foreplay, or as an alternative to sexual penetration. Pleasure for the giver during anilingus is usually based more on the principle of the act.