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 . Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing momporn so. The rise of the Internet in the late 1990s gay twinks and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. As of 2013, little analysis of this paraphilia has been reported in medical literature. Transsexual pornography is a genre of pornography. Generally, interest differs between people, and gender depends on sexual orientation. As a result, little in history was documented to give an accurate description of how female homosexuality is expressed. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. Usually that person prefers to stage the wetting so that his/her hentai sex legs become soaked with urine. Threesome can also refer to a love triangle, a three-way romantic relationship. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner.