Interest in BDSM can range from one-time experimentation to a lifestyle. Enema pornography involves adults given enemas to others, often fake. In many cases, that person is also aroused by smelling body parts that have a urine scent. In these cases, the appearance of an enlarged abdomen caused by obesity or overeating momporn may be sufficient, or simply the suggestion of a protruding navel. Japanese rope bondage is distinguished by its use of specific katas and aesthetic rules. This is also the gay hentai case in many relationships not considering themselves as sadomasochistic; it is considered to be a part of BDSM if it is practiced purposefully. Others involve partners who naturally have a significant difference in size. Gang bang pornography is a type of pornography that depicts an individual engaging in physical sexual activity with multiple partners sequentially or at once. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Some actors who are actually gay or bisexual will be marketed as straight to appeal to the allure of the unattainable, because straight men are virgins to sex with other men, and as in most gay male settings, the young, the muscular, and the unfamiliar are more sought.. 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. Felching involves drinking recently ejaculated semen from the vagina or anus. The exact source and nature of the fluid continue to be a topic of debate among medical professionals, which is also related to doubts over the existence of the G-Spot. However the genre gay fuck remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Gonzo porn is influenced by amateur pornography, and it tends to use far fewer full-body/wide shots in favor of more close-ups .