This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. 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 . Transsexual pornography is a genre of pornography. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. In human sexuality, a threesome is sexual activity that involves three people at the same time. 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 . Tentacle rape or shokushu goukan is found in some horror or hentai titles, with naked milf tentacled creatures hot gay sex having sexual intercourse with female characters. A variation on this is to place the hentai videos fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. It is sometimes combined with BDSM features. A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography.