Gay-for-pay describes male or female actors, pornographic stars, or sex workers who self-identify as heterosexual but who are paid to act or perform as homosexual professionally. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, and literature. Several hundred exclusively pegging films were produced, as well as twice as many bisexual and straight films with strap-on scenes. A sex party is a gathering at which sexual activity takes place. Transgender pornography features performers who gay boy porn cross-dress for sexual gratification, either for themselves or for their partners. Watersports pornography features sexual activities involving urine, such as golden showers. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated hentai sex products and services. Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . There may be more than two participants; both group sex and gang banging can be included. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. Stimulating milf fuck the prostate from outside, via pressure on the perineum, can be pleasurable as well. A celebrity may allow such a recording to surface willingly, as part of a publicity stunt.