Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used to describe the general activities with either partner being the receiver and the giver. Mammary intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; while a more jocular equivalent is a trip down mammary lane. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. Types of anal sex can also be a part of lesbian sexual practices. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals anime hentai in addition to traditional heterosexual roles. Irrespective of the legal or social view of pornography, it has been used in a number of contexts. Today, pornographic films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters. Clothed male, naked female is one-sided female nudity in which one or more females hot gay sex are nude while one or more men are clothed. The cover can have hinges horny milfs or be a separate part. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. Women oriented pornography is sometimes referred to as sex positive pornography. Lolita pornography caters to ephebophiles. 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. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots.