This fetish sometimes originates from childhood memories of needing, or of milf fuck seeing another needing, to urinate. It has also been recommended as a form of foreplay or safer sex. This style of filming is in contrast to having a separate, third-person camera crew filming all the action. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. The object or situation of interest is called the fetish; the person who has a fetish gay twink porn for that object/situation is a fetishist. The name of the practice, 3d hentai when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. Animal masturbation has been observed in many species, both in the wild and in captivity. Kinbaku means tight binding Kinbaku-bi which literally means the beauty of tight binding. A sub-set of vaginal fisting attempts to photograph the female cervix immediately after the fist is removed from the now-gaping vagina. Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. Sadomasochism does not imply enjoyment through causing or receiving pain in other situations . The related term twinkle-toes, which implies that a man is effeminate, tends to be used in a derogatory manner. As of 2013, little analysis of this paraphilia has been reported in medical literature. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself.