Consent is the most important criterion here. These agreements are binding in the sense that the parties have the expectation that the negotiated rules will be followed. This category also includes pornographic home movies. For other scenes, particularly in established relationships, a safeword may be agreed to signify a warning rather than explicit withdrawal of consent; and a few choose not to use a safeword at all. For legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. A sub-set of vaginal fisting attempts to photograph the female cervix immediately after the fist is removed from the now-gaping vagina. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. Depictions of male and female masturbation are common in pornography, including gay pornography. Most soft crush fetishists avoid being placed 3d hentai under the same label as hard crush fetishists, believing that crush films with larger animals give the entire group a bad label. Real enema shots or videos of true medical situations may violate privacy laws in some countries. Watersports pornography features sexual activities involving hot gay sex urine, such as golden showers. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. The current record is held naked milf by Lisa Sparks who had sex with 919 men on October 16, 2004 in Warsaw, Poland as part of the Third Annual World Gangbang Championship and Eroticon 2004. This may relate to fetishes such as voyeurism or cuckolding. Bobbi S. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Reality Reality pornography refers to real or faked amateur encounters.