Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. While some fantasize about a giantess who is slightly taller hentai sex than himself, others are interested in giantesses that are hundreds or even thousands of feet tall. In the Diagnostic and Statistical Manual of Mental Disorders , published by the American Psychiatric Association, it is classified under 302.89 – Paraphilia NOS and has no diagnostic criteria other than a general statement about paraphilias that says the diagnosis is made if the behavior, sexual urges, or fantasies cause clinically significant distress or impairment in social, occupational, or other important areas of functioning. Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra , a practice known as urethral play or sounding. Smotherboxes are usually custom made pieces of furniture that may have a special significance for their users. Medical pornography involves sexualized medical, momsex often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Low et al. Men with men Gay pornography is usually male homosexual pornography, acts depicted typically include anal or oral sex. The term breast fetishism is also used to refer to cultural attention to female breasts and the sexuality they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual males in western societies is a sexual fetish. A facial is a term for the sexual activity in which a man ejaculates semen onto the face of one or more sexual partners. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters. A heterosexual threesome may involve two gay movies men and a woman, or one man and two women - that is, two men having sex with a woman , or two women with a man. Typically, its fans identify themselves as straight.