Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Boots are seen as the perhaps most fetishistic of all footwear and boots may be the most popular fetish clothing attire. The most common male masturbation technique is simply videos porno gay to hold the penis with a loose fist and then to move the hand up and down the shaft. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. The existence of such lesbian hentai content in commercially available pornography is widely considered an urban legend. Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. Some men also enjoy anal stimulation, with fingers or otherwise, without any prostate stimulation. In 1988, a sex tape caused significant damage to Rob Lowe career. Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. The strategies and tactics that are used to smuggle one of the couple into and out of the toilet undetected are as important or almost as important as the urination. Bestiality is naked milf illegal in many countries. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. A related term used in the genre is the term cougar, which implies an older woman as predator. 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. A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and a woman, or all three having sex with each other.