Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. The arousal from being desperate comes from the sensation of having a full bladder. It is suggested that much of the obscurity and the uncertainties about female ejaculation are related to mixing up these two phenomena. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Lesbian pornography made for women is young gay porn usually made by women, and usually features women who identify as lesbian or bisexual. Softcore gay pornography also exists; it at one time constituted the genre, and may be produced as beefcake pornography for heterosexual female and homosexual male consumption. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. This may relate to fetishes such as voyeurism or cuckolding. Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship. This fetish sometimes originates porn milf from childhood memories of needing, or of seeing another needing, to urinate. Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing hentai videos also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions.