Examples of mentally oriented practices are education games, during which the dominant nude milfs requires certain forms of behavior from the submissive. Is also common of the furry genre. 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. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping anime hentai party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, hot gay sex or drawings. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Other fetish Bareback pornography features performers who are not wearing condoms. Group sex pornography features at least two men and two women , usually more, who all perform sex acts on each other. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. Dwarfs or midget pornography features performers who are dwarfs/midgets. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners.