This can, however, redirect semen into the bladder . There is no singular or archetypical behavior; therefore, a wide range of thought patterns and behaviors exist, but all tends to be a harmless and efficacious release from some kind of pressure. 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 . Multiple men and women Bisexual pornography features one woman and two men who all perform sex acts on each other. Usually that person prefers to stage the wetting gay bear porn so that his/her legs become soaked with urine. Sex parties may be organized to enable people to engage in casual sexual activity or for swinging couples or people interested in group sex to meet, but any gathering where sexual activity is anticipated can be called a sex party. This may relate to fetishes such as voyeurism or cuckolding. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. If ejaculation is onto the other person face it can be called a facial. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. 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 momporn consumption. This fetish sometimes originates from childhood hentai sex memories of needing, or of seeing another needing, to urinate. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct.