Pornography may fall into more than one genre. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. The term bondage describes the practice of Physical restraining. In the 18th and 19th centuries, some European theologians and physicians described it as heinous, deplorable, and hideous, but during the 20th century, these taboos generally declined. Those with diaper-related paraphilias differ widely in their focus of attention. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. Rainbow party A rainbow party is an urban legend spread from the early 2000s. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. Participants who exert sexual control over their partners are known as dominants or tops while participants who take the passive, receiving, or obedient role are known as anime hentai submissives or bottoms. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission videos gays as well. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Women who perform in lesbian pornography milf xxx often do not consider themselves lesbian or bisexual. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing.