Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. The naked appearance of actress Demi Moore in the advanced stage of pregnancy on the cover of Vanity Fair magazine in 1991 marked the beginning of a period which has since seen pregnancy presented by celebrities as a glamorous state of living, while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. The use of the word creampie to describe hentai sex such scenes originated in U. Sub-genres can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each momsex sub-genre appeals. Other fetish Bareback pornography features performers who are not wearing condoms. 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. If one person is penetrated by two objects, it is generically called double penetration . This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Point of view pornography is adult entertainment filmed to look as if the gaysex watcher were experiencing the sex act themselves. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. The existence of such content in commercially available pornography is widely considered an urban legend.