Matsuo used amateur actresses in his videos, and he usually traveled to their hometowns for the filming. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. Guro or Gore is lesbian hentai a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression. 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. Some couples use pornography mature milfs at times for variety and to create a sexual gay boy porn interest or as part of foreplay. Participants usually derive pleasure from this, even though many of the practices—such as inflicting pain or humiliation or being restrained—would be unpleasant under other circumstances. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Fantasies of group sex are extremely common among both men and women, and group sex is a subgenre in pornographic films. Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Such films continued to be produced but could only be distributed by underground channels.