Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. Following World War II, during big tit milf a period of social repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each other. The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. 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. 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. During anal sex, male pleasure can be particularly derived from the prostate, which can lead to an orgasm and ejaculation. It is the most common form of sexual fetishism for otherwise gay movies non-sexual objects or body parts. 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. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. Interactive pornography, hentai videos 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.