As in B/D, the declaration of the Top/Bottom may be required, though sadomasochists may also play without any Power Exchange at all, with both partners equally in control of the play. Some couples use a threesome as a way milf fuck to develop a love triangle . Fetish cuckolding gay hentai can have a wide range of expression, from pillow-talk fantasy between monogamous partners to extreme alternative lifestyles, depending on the couple. Rough sex pornography is similar to pornography featuring sadomasochism, and typically features a Top who humiliates and/or degrades a Bottom while being physically violent towards them. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Consent is the most important criterion here. Initially, few animation studios in the United States attempted to produce animation for adult audiences, but later examples of animation produced for adults would gain mainstream attention and success. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. Real jail or prison or police station shots or videos may violate laws in some countries. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Sex experts have praised various techniques that the performer can use during fellatio to increase their partner pleasure. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as gaysex the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed.