These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Asian people or Asiatic people are people who descend from a portion of Asia population. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality gaysex or same-sex attraction. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. Women in homosexual relationships responded to this designation either by hiding their personal lives or accepting the label of outcast and creating a subculture and identity that developed in Europe and the United States. Technically this is a form of exhibitionism rather than group sex per se. The name of the 3d hentai practice, when milf fuck 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. The higher pay scale and profile within a production often leads to group scenes where a straight actor only tops. A celebrity may allow such a recording to surface willingly, as part of a publicity stunt. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. 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.