The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. Reality and voyeur lesbian milfs pornography, animated videos, and legally prohibited acts also influence the classification of pornography. The industry generally hentai sex refers to such films as adult films, which is part of adult entertainment. The strategies and tactics that are used to smuggle one of the couple into and out of the toilet undetected are as important or almost as important as the urination. The term sadomasochism is derived from the words sadism gay fuck and masochism . Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. The niche popularity grew significantly in the latter half of the first decade of the 2000s.