But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records momporn for most consecutive anime hentai sex acts by one person in a short period. The fundamental principles for the exercise of BDSM require that it should be performed with the informed consent of all involved parties. Matsuo used amateur actresses in his videos, and he usually traveled to their hometowns for the filming. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. Crying pornography that features participating actors crying. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Unlike erotic films, pornographic films contain explicit sexuality and do not claim any artistic merit. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and slid up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. The term is a slang word that originated in the gay community and comes from the equestrian term bareback, which refers to the practice of riding a horse without a saddle. By Japanese law, the genitals of actors and actresses must be censored and up the mid-1990 gay fuck so was the depiction of pubic hair. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth.