The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. The name is a reference to gonzo journalism, in which the reporter is part of the event taking place. The industry generally refers to such films as adult films, which is part of adult entertainment. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. Those with diaper-related paraphilias differ widely in their focus of attention. The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. Mammary intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; momsex while a more jocular equivalent is a trip down mammary lane. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. The term sadomasochism is derived from the words sadism and masochism . Women oriented pornography is sometimes referred to as sex positive pornography. In 1988, a sex tape caused significant damage to Rob Lowe career. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. John Stagliano is considered to have started the gonzo hentai sex pornography genre with his Buttman series of films. The use of the word creampie to describe such scenes originated in U. At the end of the evening the female partners would randomly select gaysex keys from the bowl and leave with that key owner.