Animal masturbation has been observed in many species, both in the wild and in captivity. Clothed female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. Real enema shots or videos of true medical situations may violate privacy laws in some countries. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. Real jail or prison or police station shots or videos gay sex video may violate laws in some countries. Men may find stimulation nude milfs of the anus, rectum, and adjacent organs enjoyable. The term Asiaphile is sometimes used to describe the same phenomenon as is yellow fever . Male masturbation may differ between males who have been circumcised and those who have not. Sub-genres of Japanese porn Among the various sub-genres of Japanese pornography are the following: Lolicon ロリコン: This genre involves prepubescent and adolescent girls between the aged of 6-12. This technique may include the use of a simulacrum, or artificial vagina. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Crying pornography that features participating actors crying. Actual spying may violate privacy and/or trespassing laws in many countries. 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 rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. Shibari is a Japanese word that literally hentai videos means to tie or to bind. Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen.