Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Older names for a pornographic film include stag film, and blue movie. Types of anal sex can also be a part of lesbian sexual practices. The existence of such content in commercially available pornography is widely considered an urban legend. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. Yaoi is anime or manga that features gay males . Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. In Japanese, this natural-fibre rope is known as asanawa; the Japanese vocabulary does not make a distinction between hemp and jute. However, bisexual pornography is often placed near the gay section in adult video stores, gay sex video since many consumers are gay men. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. Lolicon and its contribution to the controversy regarding the regulation hentai movies of pornography of depicting minors that don’t exist has been a major issue for free speech in and outside of Japan. Films with risqué nude milfs content commenced to be produced soon after the invention of the motion picture in the 1880s.