Wirtualna wycieczka po Scat or brown pornography features defecation, manipulation milf fucking of feces, or consumption of feces, in reality or fantasy; a well-known example is the 2 Girls 1 Cup video. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. Pegging films include Strap It On , Babes Balling Boys , Strap Attack, Strap-on Sirenz, Strap-on Chicks, Boss Bitches , various movies produced by LEDA Studios, and San Francisco-based Men In Pain. The preference could be barefoot, high-heels, flip flops, and so on, depending on the fetishist. Lolita pornography caters to ephebophiles. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. The genre is popular enough in Japan that it is even the subject of parody. The term comes from the French voyeur, one who looks. Individual tastes and preferences in the area of sexuality may overlap among these areas, which are discussed separately here. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Some prefer a particular type of clothing to urinate. Drama Hardcore showed this kind of film on its film. Pornographic films are produced and supplied on a variety of media, depending on demand and the technology available, including traditional film stock in various formats, video for home viewing, DVD, Internet download, cable TV and other media. 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. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Cheerleader pornography involves pictures of cheerleaders, both staged and real.