Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. It is suggested that much of the obscurity and the uncertainties about female ejaculation are related to mixing up these two phenomena. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. The work of Bruce Seven has been called reality porn, due to his lack of using scripts and asking his performers to act naturally in their own character. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. Can also include gay twink porn auto-fellatio, or performing oral sex on oneself. There were also a very limited number of specialist fetish magazines which hentai porn featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering naked milf fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. When all regions of the face are included, facial cum shots comprise approximately 62% of scenes where external ejaculation occurs. Arousal may be triggered by seeing the body movements or facial expressions of that person. This technique may include the use of a simulacrum, or artificial vagina. Clothed female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. The first film was released in 1980 starring Kay Parker. 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. Going back at least as far as the Christy twins in the 1970s, depictions of incest and particularly incest between twins has been a feature of gay pornography.