There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. The term has origins in the Greek language . Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Sadism describes sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. 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. HIV is among the infections that require such direct contact and is therefore very unlikely to be transmitted via mammary intercourse. Foot fetishism anime hentai has been defined as a pronounced sexual interest in the feet or footwear. Such works have also often been subject to censorship and other legal restraints to publication, display or possession. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Other fetish Bareback pornography features performers who are not wearing condoms. Internationally, hentai is a catch-all term to describe a genre of anime and manga gay sex video pornography. Ass to mouth is a slang momsex term primarily used to describe the withdrawal of a penis from the receptive partner anus followed by the immediate insertion into the receptive partner mouth.