Since at least 1973, it has also been used to refer to a sexually attractive young woman. Bhabha, Anne McClintock and Kobena Mercer. There may be more than two participants; both group sex and gang banging can be included. Facial cum shots are currently regularly portrayed in pornographic films and videos, hentai sex often as a way to close a scene. One-sided male nudity can also arise when a male disrobes as part of a male striptease. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. 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. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. Japanese rope bondage is distinguished by its use of specific katas and aesthetic lesbian milfs rules. Pornography is often referred to as porn and a pornographic work as a porno. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. The padding may also muffle noises from the outside, causing a relaxation effect and heightening their other senses. 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. The sub-genres usually conform to certain conventions, and gay sex video each may appeal to a particular audience. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur.