When early sexologists in the late 19th century began to categorize and describe homosexual behavior, hampered by a lack of knowledge about homosexuality or women sexuality, they distinguished lesbians as women who did not adhere to female gender roles and incorrectly designated them mentally ill—a designation which has been reversed in the global scientific community. It is also referred to as anal–oral contact and anal–oral sex, or colloquially as rimming or a rim job, and may be performed by or on people of any sexual orientation for personal pleasure or as a form of erotic humiliation. The resulting consent and understanding is occasionally summarized in a written contract, gay movies which is an agreement of what can and cannot take place. In a few relationships, it leads as far as total submission of one partner in the truest sense of the phrase total power exchange . Drama Hardcore showed this kind of film on its film. Works in this genre may explore philosophical, political or social issues. Andrews cross or spreader bars. The choice of position takes into account the spankee comfort in the position for long periods of time, the spanker ability to swing at the spankee at a comfortable, natural angle, complete access to the spankee buttocks, the spanker control of the spankee position and ability to read just as necessary, safety, and the amount of strength the top is able to generate from such a position. A related term used in the genre is the term hentai sex cougar, which implies an older woman as predator. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet. The precise definition of roles and lesbian milfs self-identification is a common subject of debate, reflection, and discussion within the community. Such video tapes are often released without the consent of their subjects, and could potentially damage celebrities careers.