Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. English adopts and uses hentai as a genre of pornography by the hentai porn commercial sale and marketing of explicit works under this label. Matsuo used amateur actresses in his videos, and he usually traveled to their hometowns for the filming. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. Mammary intercourse is said by Alex Comfort to produce mutual gay boy porn orgasm in women celebrity porn with sensitive breasts , and it was one of the nine substitute lesbian milfs exercises for penetrative sexual activities, as detailed in cartoon porn comics the Paradis Charnels of 1903. Other possibilities are possible, such as a man having sex with two women who are having sex with each other. Mammary intercourse is a sex act, performed as foreplay or as non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa. 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. The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. 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. 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.