Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. 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. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. Kurt Wild, who appeared as a bottom in Lucas Entertainment Gigolos, is married to a woman and has three children. It is also followed by dedicated industry publications and trade groups gay movies as well as the mainstream press, private organizations , government lesbian hentai agencies, and political organizations. The existence of such content in commercially available pornography is widely considered an urban legend. Typically featured are hitting, choking, name-calling and hair-pulling. 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. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. Both forms of pornography generally contains nudity. Such ejaculation can be done by mammary intercourse, or masturbation over the other person, or result from the withdrawal of the penis from a partner mouth as he is ejaculating following fellatio, irrumatio, or intercourse. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen momsex is greatly reduced. It is sometimes combined with BDSM features. Transsexual pornography is a genre of pornography. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear.