Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor . Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. While some fantasize about a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall. In Japanese, the term describes hentai porn any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. As women, they face concerns separate from men. Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. The industry generally refers to such films as adult films, which is part of adult entertainment. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. In the West, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment. The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up and down the milf xxx shaft. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. It has since become popular enough with couples to be discussed during an episode of Sex and the City. The cover can have hinges or be a separate part.