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. Transsexual pornography features transwomen performers, who typically have male genitalia and gay boy porn augmented female breasts . Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. They cited the Internet and text messaging as common ways of organising meetings. It may be used as foreplay, or as an alternative to sexual penetration. Such films continued to be produced but could only be distributed by underground channels. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. The most common depiction of a hermaphrodite is a person with a female face, breasts, and build, hentai sex and a penis , although there are other combinations. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. Crying pornography that features participating actors crying. In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts nude milfs it into a second recipient mouth. One-sided male nudity can also arise when a male disrobes as part of a male striptease.