Technically this is a form of exhibitionism rather than group sex per se. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. In many cases, that person is also aroused by smelling body parts that have a urine scent. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Big Beautiful Woman is a euphemism for an gay movies overweight woman and is frequently used in the context of fat fetishism. Japanese rope bondage is distinguished by its use of specific katas and aesthetic rules. Mutual masturbation is a sexual act where two or more people stimulate themselves or one another sexually, usually with the hands. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. Hugo Ohira, director of marketing for Silvercash, rhetorically asks Who does not like spewing their load on a pretty young face? Fisting involves the insertion of one partner entire hand into a vagina or the anal cavity. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. In recent years, Japanese films of this genre have become more common in the USA and Europe although it still hentai porn remains a small, fetish-oriented part of the adult film industry. Watersports pornography features sexual activities involving urine, such as golden showers. Matsuo used horny milfs amateur actresses in his videos, and he usually traveled to their hometowns for the filming. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario.