Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian or bisexual. The fundamental gay twink porn principles for the exercise of BDSM require that it should be performed with the informed consent of all involved parties. High heel pornography involves women or men dressed in high heeled shoes. Sloppy seconds is a slang phrase for when a man has sexual intercourse with another person who already has received another man penis in the relevant orifice and is therefore wet or sloppy. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. Actors are mostly amateur; any well-known actors in bisexual porn tend to be from the gay pornography industry. In many cases, anime hentai that person is also aroused by smelling body parts that have a urine scent. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Softcore pornography generally contains nudity or partial nudity in sexually suggestive situations, but without explicit sexual activity, sexual penetration or extreme fetishism, while hardcore pornography may contain graphic sexual activity and visible penetration, including unsimulated sex scenes. 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. A common way that these are depicted in a single scene is with one woman and two men performing together. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. Sometimes special furniture is used, such as a queening nude milfs stool or smotherbox. Can also include auto-fellatio, or performing oral sex on oneself. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen.