Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. The industry generally refers to such films as adult films, which is part of adult entertainment. Some prefer a particular type of clothing to urinate. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. Erotic spankings are commonly combined with other forms of sexual foreplay. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. This is commonly called double vaginal penetration or double stuffing. As the prostate is touch-sensitive, some directly stimulate it using a well-lubricated finger or dildo inserted through the anus into the rectum. A lesbian is hentai porn a female homosexual; a female who experiences romantic love or sexual attraction to other females. Some men enjoy masturbating during pegging. The consensual submission porn milf of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. A person may be sexually penetrated multiple times simultaneously. A bisexual threesome may involve a man having sex with a man and a woman, the woman having sex with a man and videos gays a woman, or all three having sex with each other. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. 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.