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. 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. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, at home, in private clubs and also at night cinemas. In pornography, depictions of lesbian sex form a popular subgenre, directed toward a male heterosexual and female homosexual audience. As a result, little in history was documented to gay boy porn give an accurate description of how female homosexuality is expressed. In modern BDSM vernacular, the queening stool allows open access to the crotch while seated. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Transsexual pornography is a genre of pornography. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. The term Asiaphile is sometimes momsex used to describe the gay hentai same phenomenon as is yellow fever . Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates.