Male masturbation may differ between males who have been circumcised and those who have not. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. Consent is the most important criterion here. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques. Reality Reality pornography refers to real or faked amateur encounters. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals . Men and women may masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . This fetish sometimes originates from childhood memories of needing, or of seeing another needing, gay sex video to urinate. Many men who like lesbian milfs trans partners of any variety, hentai videos known as tranny chasers, do not necessarily identify as gay themselves. Generally, interest differs between people, and gender depends on sexual orientation. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression. It may also involve touching, rubbing, or pinching the nipples or other erogenous zones while masturbating. Since at least 1973, it has also been used to refer to a sexually attractive young woman. Fantasies of group sex are extremely common among both men and women, and group sex is a subgenre in pornographic films.