Mammary intercourse is a sex act, performed as foreplay or as non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, and literature. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. Reality gay movies and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. A sex party is a gathering at which sexual activity takes place. Yaoi is anime or manga that features gay males . 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 hentai videos presented by celebrities as a glamorous state of living, momsex while also creating a market for photographers to produce images of pregnant mothers, and for fashion stylists to introduce pregnancy styling to their business. Lolicon and its contribution to the controversy regarding the regulation of pornography of depicting minors that don’t exist has been a major issue for free speech in and outside of Japan. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. In academic discourse, racial fetishism is a postcolonialist term found in the writings of authors such as Homi K.