The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity gay bear porn fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Tentacle erotica can be consensual, but frequently contains elements hentai porn of non-consensual sex. Shibari is a Japanese word that literally means to tie or to bind. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. If dramatic skills are not involved, a performer in a porn film may also be called a model. Dwarfs or midget pornography features performers who are dwarfs/midgets. Omorashi: lesbian milfs The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. Spanking can be administered in a number of spanking positions. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers, extreme body mod enthusiasts, animal players, latex or rubber aficionados, and others. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. Types of anal sex can also be a part of lesbian sexual practices. As of 2013, little analysis of this paraphilia has been reported in medical literature. Even though the performers who perform in these films typically appear on many reality websites within a short span of time, most of these websites claim that each of them is an amateur. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well.