Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. As of 2013, little analysis of this paraphilia has been reported in medical literature. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. Pornography is often referred to gay cock as porn and a pornographic work as a porno. Voyeurism: Seeing another urinate without the person knowledge either through video taping by a hidden camera, or by lurking in locations where people hentai porn are urinating or are likely to have an urge to urinate. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals . Pornography in the early 2000s. 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 momporn actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend. Softcore gay pornography also exists; it at one time constituted the genre, and may be produced as beefcake pornography for heterosexual female and homosexual male consumption. The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results.