The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person anus, or anus and rectum, for sexual pleasure. With second wave feminism and growth of scholarship in women history and sexuality in the 20th century, the definition of lesbian broadened, sparking a debate about sexual desire as the major component to define what a lesbian is. Individuals who can change porn milf between top/dominant and bottom/submissive roles—whether from relationship to relationship or within a given relationship—are known as switches, though the term switch in this context is occasionally seen as derogatory videos porno gay and is rejected by many who might simplistically fit the definition. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. Often a dominant woman, she may be called a Dom, Domme /ˈdɒm/, Femdomme, Domina, or Dominatrix, depending on context or personal preference. Scenes of multiple penetration are common in hentai videos pornography. Weather Report Girl is considered yuri hentai in English usage for its depiction of lesbian sex, but in Japan it is just yuri. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. In the United States, creating, distributing, or possessing crush videos has been illegal since 1999, and many other countries also have banned them. 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 . The legal status of masturbation has also varied through history and masturbation in public is illegal in most countries. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably.