One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. Strictly speaking, bondage means binding the partner by tying their appendages together; for example, by the use of handcuffs or by lashing their arms to an object. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. The term hentai is never used in this context in Japanese. In the 1970s, anime hentai the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. Male masturbation may differ between males who have been circumcised and those who have not. Comic books often featured characters being tied up and tying others up, particularly in gay twinks damsel in distress plots. 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. 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. If ejaculation is onto the other person face it can be called a facial. This category also includes pornographic home movies. First found in softcore movies and erotic thrillers, depictions of lesbianism momporn entered mainstream cinema in the 1980s. Clothed female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene.