However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. Arousal may be triggered by seeing the body movements or facial expressions of that person. 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. It can also be heightened by the person saying that they have to urinate. However the genre remains a very small proportion of the pornographic DVD market; for hot gay sex example at porn retailer HotMovies. In many cases, that person is also aroused by smelling body parts that have a urine scent. While bondage is a very popular variation within the larger field of BDSM, it is nevertheless sometimes differentiated from the rest of this field. Using the term shemale for a transsexual woman often implies that she is working in the sex trade. Also see POV. Cum-shot pornography features a collection nude milfs of male ejaculation scenes. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. With second wave feminism and growth of scholarship in women history and sexuality in the 20th century, the definition of lesbian broadened, sparking hentai porn a debate about sexual desire as the major component to define what a lesbian is. The 1979 U. Squirt pornography involves women ejaculating. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. The term is a slang word that originated in the gay community and comes from the equestrian term bareback, which refers to the practice of riding a horse without a saddle. Group sex can occur between people of all sexual orientations and genders.