The loose and direct camera work often includes tight shots of the genitalia, unlike some traditional porn. In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers to actors labeled videos porno gay or believed to be straight but who engage in same-sex sexual activities for money. Milking pornography features lactating women being milked or milking themselves . Some are aroused from wetting their diapers, others like messing their diapers. The introduction of the home video and Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape. It is also referred to as anal–oral contact and anal–oral sex, or colloquially as rimming milf xxx or a rim job, and may be performed by or on people of any sexual orientation for personal pleasure or as a form of erotic humiliation. Breast fetishism is a paraphilic sexual interest focused on female breasts . No causal relationship is known between masturbation and any form of mental or physical disorder. 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. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. Some pornographic films use an artificial semen substitute to simulate or enhance creampie hentai videos shots. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds.