As in B/D, the declaration of the Top/Bottom may be required, though sadomasochists may also play without any Power Exchange at all, with both partners equally in control of the play. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. Clothed anime hentai female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Group sex can occur between people of all sexual orientations and genders. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. Crying pornography that features participating actors crying. The term Asiaphile is sometimes used to describe the same phenomenon as is naked milf yellow fever . It is commonly depicted in pornography, but very rarely gay twink porn in mainstream cinema. Pornography is often referred to as porn and a pornographic work as a porno. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. The work of Bruce Seven has been called reality porn, due to his lack of using scripts and asking his performers to act naturally in their own character. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. Male masturbation may differ between males who have been circumcised and those who have not. The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching.