In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. Pornography is often referred to as porn and a pornographic work as a porno. The 1979 U. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Pornographic films are generally classified into sub-genres which describe the lesbian hentai sexual fantasy which the film and actors attempt to create. While bondage is a very popular variation within the larger field of BDSM, it is nevertheless sometimes differentiated from the rest of this field. It may be used as foreplay, or as an alternative to sexual penetration. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. Squirt pornography involves women ejaculating. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. As a result, little in history was documented to give an accurate description of how female homosexuality is expressed. It is sometimes hot gay sex described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. There is also some evidence that pornography can be used to treat voyeurism. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. Other possibilities are possible, such as a man having sex with two women who are having sex with each other. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing so. When he is in position the cover is closed. It may also involve touching, rubbing, or pinching nude milfs the nipples or other erogenous zones while masturbating.