Courtesans, hetaeras, tawaif-s, ji-s--these women have exchanged artistic graces, elevated conversation, and sexual favors with male patrons throughout history and around the world. Of a different world than common prostitutes, courtesans deal in artistic and intellectual pleasures in ways that are wholly interdependent with their commerce in sex. In pre-colonial India, courtesans cultivated a wide variety of artistic skills, including magic, music, and chemistry. In Ming dynasty China, courtesans communicated with their patrons through poetry and music. Yet because...