A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. Greater economic and social freedom allowed them gradually to be able to determine how they could form relationships and families. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. Bareback sex is physical sexual activity, especially sexual penetration, without hentai sex the use of a condom. To tea bag is a slang term for the sexual act of a man placing his scrotum in the mouth of a willing sexual partner for pleasure or onto the face momsex or head of another person. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, videos porno gay like video series that specialize in showing the act. In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. The higher pay scale and profile within a production often leads to group scenes where a straight actor only tops.