Some women who engage in same-sex sexual activity may reject not only identifying hentai movies 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. 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 games , and big tit milf pornographic anime . 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. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve gay cock sexual and nonsexual erotic scenarios. Kinbaku means tight binding Kinbaku-bi which literally means the beauty of tight binding. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s.