Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. Threesome can also refer to a love triangle, a three-way romantic relationship. Kurt Wild, who appeared as a bottom in Lucas Entertainment Gigolos, is married to a woman anime hentai and has three children. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Multiple men and women Bisexual pornography features one woman and two men who all perform sex acts on each other. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. Sigmund Freud considered foot binding as a form of fetishism. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. This is commonly called double vaginal penetration momsex or double stuffing. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. Many cultures describe pain as an aphrodisiac. The niche popularity grew significantly in the latter half of the first decade of the 2000s. The term sadomasochism is derived from the words sadism and masochism . Types of anal sex can also be a part of lesbian sexual practices. In Japan, point of view pornography is referred to as hamedori . Once insertion is complete, the fingers are either clenched into a fist or kept hot gay sex straight. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots.