Gay-for-pay describes male or female actors, pornographic stars, or sex workers gay sex video who self-identify as heterosexual but who are paid to act or perform as homosexual professionally. In more vigorous forms of fisting, such as punching or punchfisting, mature milfs a fully clenched fist may be inserted and withdrawn slowly. This may relate to fetishes such as voyeurism or cuckolding. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. Performers are usually clean-shaven, thinner and more effeminate than hentai porn ones in mainstream gay pornography. There were also a very limited number of specialist fetish magazines which featured images of bondage, such as the famous Bizarre magazine published from 1946 to 1959 by the pioneering fetish photographer John Willie, and ENEG Exotique magazine, published 1956-1959. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Animal masturbation has been observed in many species, both in the wild and in captivity. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual partner without a similarly formalized power relationship. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well. Pornography in the early 2000s. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene.