The term discipline describes psychological restraining, with the use of rules and punishment to control overt behavior. Gay-for-pay describes male or female actors, pornographic stars, or sex workers who self-identify as heterosexual but who are paid to act or perform as homosexual professionally. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Femdom features BDSM scenes in which the dominant partner is female. Celebrity sex tapes are amateur or professionally-made recordings of sex acts, as performed by a celebrity and their partner. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; anime hentai they have been called the counterimage of facials. As of 2013, little analysis of this paraphilia has been reported in medical literature. Cuckold fetish pornography that involves a cuckolded husband. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred horny milfs to as a Dom for a man, and a Domme for a woman. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. Sigmund Freud considered foot binding as a form of fetishism. Simultaneous penetration gay twink porn of the mouth and either the vagina or anus. Terminology for roles varies widely within the various BDSM subcultures.