For celebrity porn legal reasons, the vast majority of so-called reality porn involves professional actors and actresses posing as so-called amateurs. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Sex parties may be organized to enable people to engage in casual sexual activity or for swinging couples or people interested in group sex to meet, but any gathering where sexual activity is anticipated can be called a sex party. For circumcised males, on whom the glans is mostly or completely uncovered, this technique creates more direct contact between the hand and the glans. A celebrity may allow such a recording to surface willingly, as part of a publicity stunt. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. Interracial pornographic lesbian hentai films horny milfs have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. The other person may do the same during or after. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. Throughout history, women have not had the same freedom or independence to pursue best mobile porn homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. Both forms of pornography generally contains nudity. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well. Diaper pornography involves performers wearing diapers, sometimes with an adult performer acting in the role of a caretaker. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Because the viewing of such films carried a social stigma, they were viewed at brothels, gay boy porn adult hottest celebrities movie theaters, stag parties, at home, in private clubs and also at night cinemas.