Such documents have not been recognized as being legally binding, nor are they intended to be. One sex worker said that mammary intercourse was one alternative used; mammary intercourse performed by a woman with large breasts felt to the client like penetrative vaginal sex. It therefore has the connotation of being wild, dangerous, and fun. Furthermore, the DSM-IV-TR notes, Fantasies, behaviors, or objects are hentai sex paraphilic only when they lead to clinically significant distress or impairment . People may also find masturbating horny milfs with friends helps lift the stigma they feel surrounding the act. Yaoi male homosexual hentai designed to appeal to women and men. Some intend to create situations where others can see their wet clothing. Smotherboxes are usually custom made pieces of furniture that may have a special significance for their users. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. The resulting consent and understanding gay fuck is occasionally summarized in a written contract, which is an agreement of what can and cannot take place. Gang bang pornography usually depicts numerous men having sex with one woman, or one man. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Testosterone discourages fat storage in these areas. Cartoon pornography depicts illustrated or animated fictional characters in erotic and sexual situations. Drama Hardcore showed this kind of film on its film. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Some people masturbate by using machines that simulate intercourse. Key party A key party is a form of swinger party, in which male partners place their car and house keys into a common bowl or bag on arriving.