A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. As of 2013, little analysis of this paraphilia has been reported in medical literature. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. Shibari is a Japanese word that literally means to tie or to bind. Real medical shots or videos may violate hentai videos privacy laws in some countries. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. The other person may do the same during or after. Cuckold fetish pornography that involves a cuckolded husband. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Depictions of male and female masturbation are common in pornography, gay bear porn including gay pornography. Simultaneous penetration of the mouth and either the vagina or anus. Each participant may engage in any type of sex acts with one or both of the others, such as milf fuck vaginal, anal or oral sex or mutual masturbation. Usually that person prefers to stage the wetting so that his/her legs become soaked with urine. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Threesome can also refer to a love triangle, a three-way romantic relationship. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 so was the depiction of pubic hair. 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 .