Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. One-sided male nudity can also arise when a male disrobes as part of a male striptease. The principal characteristic of voyeurism is that the voyeur does not normally interact directly with the subject of his/her interest, who is often unaware of being observed. Lesbian pornography made for women is usually made by momsex women, and usually features women who identify as lesbian or bisexual. Gonzo porn is influenced by amateur pornography, gay hentai and it tends to use far fewer full-body/wide shots in favor of more close-ups . The term discipline describes psychological restraining, with the use of rules and punishment to control gay bear porn overt behavior. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Partners can engage in penetrative sex, known as full swap, or choose to soft swap in which they engage only in non-penetrative sex. They cited the Internet and text messaging as common ways of organising meetings. In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Simultaneous penetration of the mouth and either the vagina or anus. Failure to honor a safeword is considered serious misconduct and could even change the sexual consent situation into a crime, depending on the relevant law, since the bottom has explicitly revoked his or her consent to any actions that follow the use of the safeword .