Lesbian erotica deals with depictions in the visual arts of lesbianism, which is the expression of female-on-female sexuality. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism (as for sexuality in general) to be erotic. For much of the history of cinema and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. In pornography, depictions of lesbian sex form a popular subgenre, directed toward male heterosexual audiences, lesbian audiences, and bisexual audiences of any gender. Cultural background Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. Visual arts Classic and classical depictions Depictions of lesbianism are found among the erotic frescoes of Pompeii. Having all but disappeared during the Middle Ages, they made a comeback after the Renaissance. François Boucher and J. M. W. Turner were among the forerunners of 19th century artists who featured eroticism between women among their work. Like other painters (such as Jean-Honoré Fragonard), Boucher found inspiration in classical mythology. He was one of many artists to use various myths surrounding the goddess Diana, including the often-depicted story of Callisto, Diana's nymph who was seduced by Jupiter, with the god taking Diana's form since Callisto had vowed chastity. 19th-century developments In the 19th century, lesbianism became more openly discussed and found its way into many fields of art. In France, the influence of Charles Baudelaire is considered crucial, on literature as well as on the visual arts, though according to Dorothy Kosinski it was a matter not for the high arts but mostly for popular erotica. Auguste Rodin's illustrations for Baudelaire's Les Fleurs du Mal included lesbian scenes. Gustave Courbet's Le Sommeil (1866) illustrates a scene from the 1835 story "Mademoiselle de Maupin" by Théophile Gautier (though Baudelaire's "Delphine et Hippolyte" from Les fleurs is also cited as an inspiration), depicting two women asleep after love-making. Its lesbian subject matter was controversial enough to be the subject of a police report in 1872, but Courbet's painting is