A naked celebrities sexual fetish may be regarded as an enhancing element to a romantic/sexual relationship achieved in ordinary ways or as a mental disorder/disorder of sexual preference if it causes significant psychosocial distress for the person or has detrimental effects on important areas of their life. Scenes of multiple penetration are common in pornography. In recent years, Japanese films of this genre have become more common in the USA and Europe although it still remains a small, fetish-oriented part of the adult film industry. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus , and pegging. 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. 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. A facial is a form of non-penetrative sex, though it is generally performed after some other means of sexual stimulation, such as vaginal sex, anal sex, oral sex or masturbation. In many cases, that person is also aroused by smelling body parts that have a urine scent. It explores the more mental aspect of BDSM. Japanese rope bondage is distinguished by its use of specific katas and aesthetic rules. These gay bear porn typically hentai videos are leaked to the public via the Internet, with or without the celebrity consent. Another variant of reality pornography consists of normal couples that are celebrity nudes filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Am Abend , one of the earliest pornographic films horny milfs that have been collected at the Kinsey Institute for Research in Sex, Gender, and Reproduction, starts with a female masturbation scene.