Works in this genre may be considered adult for any number of reasons. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. Urolagnia is a form of salirophilia in which sexual excitement is associated with hentai movies the sight or big tit milf thought of urine or urination. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. Pornography may fall into more than one genre. There is, however, no third party camera work involved. Testosterone discourages fat storage in these areas. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Mammary intercourse is a sex act, performed as foreplay or as non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa. This is commonly called double vaginal penetration or double stuffing. The term bondage describes the practice of Physical restraining. 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. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Female dominance refers to BDSM relationships and BDSM scenes in which the dominant partner is female. Other objects such as ball point pens and thermometers are sometimes used, gay twinks although this practice can lead to injury and/or infection. If one person is penetrated by two objects, it is generically called double penetration . Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998.