Advocates of RACK argue that SSC can hamper discussion of risk because no activity is truly safe, and that discussion of even low-risk possibilities is necessary for truly informed consent. If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Men may find stimulation of the anus, rectum, and adjacent organs enjoyable. For legal reasons, the vast majority of so-called reality porn involves lesbian hentai professional actors and actresses posing as so-called amateurs. In human sexuality, a threesome is sexual activity that involves three people at the same time. Diaper pornography involves performers wearing diapers, sometimes with an gay sex video adult performer acting in the role of a caretaker. As of 2013, little analysis of naked milf this paraphilia has been reported in medical literature. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. There may be more than two participants; both group sex and gang banging can be included. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. 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.