Some women who engage in same-sex sexual activity may reject not only identifying as lesbians but as bisexual as well, while other women self-identification as lesbian may not align with their sexual orientation or sexual behavior; sexual identity is not necessarily the same as one sexual orientation or sexual behavior, due to various reasons, such as the fear of identifying their sexual orientation in a homophobic setting. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. In human sexuality, a threesome is sexual activity that involves three people at the same time. A homosexual threesome would involve either three men or three women. Older names for a pornographic film include stag film, and blue movie. Starting with erotic stories and woodblock prints from before the 20th century, Japanese pornography evolved into distinct subcategories with the media that in addition of pornographic videos and magazines featuring live actors, there is exist categories of pornographic manga , pornographic computer young gay porn games , and pornographic anime . The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. Some straight actors have started acting in gay porn only to be accused of being gay while others first step was to strictly do solo scenes. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity lesbian milfs or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal.