Mutual masturbation foreplay The manual stimulation of each other genitals where the session eventually leads to sexual intercourse. The term has also applied to other professions and even companies trying to appeal to a gay demographic. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. See hentai sex also Gay-for-pay. The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. Other fetish Bareback pornography features performers who are not wearing condoms. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Coprophilia , also called scatophilia or scat , is the paraphilia gay sex video involving sexual arousal and pleasure from feces. Biological anthropologist Helen B. These styles are much closer to the style of bondage scenes in mainstream television. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. Those with diaper-related paraphilias differ widely in their focus of attention. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. In Japanese, the term describes any type of perverse lesbian milfs or bizarre sexual desire or act; it does not represent a genre of work. Swinging can take place in various contexts, ranging from a spontaneous sexual activity at an informal social gathering of friends to a regular social gathering in a sex club or residence. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds.