A variation on this 3d hentai is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. 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. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. A sub-set of vaginal fisting attempts to photograph the female cervix immediately after the fist is removed from the now-gaping vagina. Examples include lesbian milfs the Girls Gone Wild and Girls Who Like Girls Series. Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. Both forms of pornography generally contains nudity. Hentai is the various videos gays forms of Japanese pornography, including H-manga, H-anime, and H-computer games. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. The name is a reference to gonzo journalism, in which the reporter is part of the event taking place. Pregnancy fetishism is a context where pregnancy is seen by individuals or cultures as an erotic phenomenon. The phrase is commonly found on porn sites. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. This stop and go build-up, known as edging, can achieve even stronger orgasms.