Comic books often featured characters being tied up and tying others up, particularly in damsel in distress plots. Femdom features BDSM scenes in which the dominant partner is female. Originating momporn in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. 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 hentai movies videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer games , and pornographic anime . The prostate gland is one of the organs that contributes fluid to semen. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing so. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Portrayals of lesbians in the media suggest that society at large has been simultaneously intrigued and threatened by women who challenge feminine gender roles, and fascinated and appalled with women who are romantically involved with other women. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games. The smotherbox is placed on a stable surface. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. The existence of such content in commercially available pornography is widely considered an urban legend. In academic discourse, gay sex video racial fetishism is a postcolonialist term found in the writings of authors such as Homi K.