In human sexuality, a threesome is sexual activity that involves three people at the same time. Ass to mouth pornography shows the momporn transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Group sex is sexual behavior involving more than two participants. If dramatic skills are not involved, a performer in a porn film may also be called a model. The phrase is commonly found on porn sites. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. It is sometimes combined with BDSM features. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. As of 2013, little analysis of this gay movies paraphilia has been reported in medical literature. Other possibilities are possible, such as a man having sex with two women who are having sex with each other. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. Transsexual people Transman pornography features performers who were born female and who lesbian hentai medically transitioned to male. A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship.