Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Ass to mouth is a slang 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. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. In humans, females generally have more round and voluptuous buttocks, gay movies caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. Masturbation is the self-sexual stimulation of the genitals for sexual horny milfs arousal or other sexual pleasure, usually to the point of orgasm. Threesome or 3some pornography features one man and two women . The terms Big Beautiful Women and BBW were coined by Carole Shaw in 1979, when she launched BBW Magazine, a fashion and lifestyle magazine for plus-size women Fat fetishism is the strong or exclusive sexual attraction to overweight or obese people. Lolita pornography caters to ephebophiles. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Biological anthropologist 3d hentai Helen B. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience; and rarely in anonymous settings, such as at orgies or other sex parties.