The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from the submissive. Interactive pornography, available in CD-ROM and DVD format, allows the viewer to select the particular acts performed at any one time, sometimes with the camera providing a first person view. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. In the West, masturbation in private or with a partner is generally considered a normal and healthy mature milfs part of sexual enjoyment. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Common positions include lying on back or face down, sitting, squatting, kneeling or standing. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed against it. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses gay hentai . This genre also features male-on-male fellatio through a small hole made in a bathroom divider. 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. The term has origins in the Greek language gay boy porn . In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography is a different phenomenon, the expulsion of clear and abundant fluid, which has been shown to be a diluted fluid from the urinary bladder.
