Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. 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 videos gays sex acts by one person in a short period. Targets the male audience, but is mature milfs much less popular than Yaoi. Transsexual people Transman pornography features performers who were born female and who medically transitioned to male. Group sex is sexual behavior involving more than two participants. Actual upskirt or downblouse hentai porn shots may violate privacy laws in some countries. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. 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. Failure to honor a safeword is considered serious misconduct and could even change the sexual consent situation into a crime, depending on the relevant law, since the bottom has explicitly revoked his or her consent to any actions that follow the use of the safeword . Bisexual DVDs sell much better online than in adult video stores, possibly due to customers in stores feeling embarrassed to buy them. There is no singular or archetypical behavior; therefore, a wide range of thought patterns and behaviors exist, but all tends to be a harmless and efficacious release from some kind of pressure. Since at least 1973, it has also been used to refer to a sexually attractive young woman. Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. Shemale is a term primarily used in sex work to describe a trans woman with male genitalia combined with female secondary sex characteristics, usually including augmented female breasts, from breast augmentation and/or use of hormones.