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. This type of stimulation is typically all that is required to achieve orgasm and ejaculation. In some areas, there are laws stating it is not legally possible to consent to be killed, and elsewhere it may still be legally dubious . 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 gay sex video sexual desire as the major component to define what a lesbian is. There is a substantial amount of incest pornography on the Internet, leading some to argue it may legitimize or encourage real-life incest. Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured. Dominance and submission is a set of behaviors, customs and rituals relating to the giving and accepting of control of one individual over another in an erotic or lifestyle context. In a separate article analyzing 12 men who engaged in bestiality, an additional analysis of an 11-man subgroup revealed that 6 had engaged in coprophilic behavior, compared with only 1 in the matched control group consisting of 12 SM-oriented males who did not engage in bestiality. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. There are many other variations on male masturbation techniques. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. It can also be heightened by the person saying that they have to momsex urinate. Pleasure for the giver during anilingus is usually based more on the principle of the act. In straight pornography, intercourse is often followed by a facial, pearl necklace or other visible ejaculation.