This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. 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. The use of the lesbian hentai word creampie to describe such scenes originated in U. Yuri : Featuring two grown adult women in a homosexual/lesbian relationship. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect clitoral/G-spot stimulation in women, and associated sensory nerves . This is commonly called double vaginal penetration or double stuffing. Gay pornography is the representation of sexual activity gay fuck between males. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. The neologism pegging was popularized naked milf when it became the winning entry in a contest in Dan Savage Savage Love sex advice column, held after an observation was made that there was no common name for the act. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. A spanking may be carried out with the use of a bare or gloved hand, or with any of a variety of implements, including a paddle, strap, hairbrush, feather duster or belt. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. At the end of the evening the female partners would randomly select keys from the bowl and leave with that key owner.