Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. 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. This technique may include the use of a simulacrum, or artificial vagina. Sexual scenarios may involve male domination, female submission, exhibitionism and erotic entertainment. Squirt pornography involves women ejaculating. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. The term hentai is never used in this context in Japanese. Erotic spanking is the act of spanking another person for the sexual arousal or gratification of either or both parties. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. Sadomasochism does not imply enjoyment through causing or receiving momporn pain in other situations . The Japanese sex industry uses the term Paizuri hentai videos . 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. Since at least 1973, it has also been used to refer to a sexually attractive young woman. Bukkake, Gokkun, young gay porn Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. Shemale is a term primarily used in sex work to describe a trans woman with male genitalia combined with female secondary sex characteristics, usually including augmented female breasts, from breast augmentation and/or use of hormones.