Hentai is the various forms of Japanese pornography, including H-manga, H-anime, and H-computer games. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. 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. Pleasure for the giver during anilingus is usually based more on the principle of the act. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors hentai sex by race has diminished considerably. The fundamental principles for the exercise of BDSM require that it should be performed with the informed consent of all involved parties. The sub-genres usually conform to certain conventions, and each may appeal to a particular audience. It may also involve touching, rubbing, or pinching the nipples or other erogenous zones while masturbating. This is also the case in many relationships not considering themselves as sadomasochistic; it is considered to be a part of BDSM if it is practiced purposefully. There are currently no known laws forbidding the crushing of objects and insects, however the production or trade of crush erotica involving live vertebrates is condemned by animal rights activists and is illegal in many countries, including the United States and Great Britain. Partners can engage in penetrative sex, known as full swap, or choose to soft swap in which they engage only in non-penetrative sex. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts it into a second recipient mouth. In many cases, that person is also aroused by smelling body parts that have naked milf a urine scent. This is why video stores might consider stocking transgendered subject matter in the straight gay sex video section, as some straight men will have passive or active sex with another man as long as their partner appears to look like a woman to them, to some minor or major degree.