Female Relationships in Early Modern England - Maids and Mistresses, Cousins and Queens: Women's Alliances in Early Modern England. By Susan Frye and Karen Robertson, eds. New York: Oxford University Press, 1999. Pp. xviii + 350. $19.95 (paper). - Invisible Relations: Representations of Female Intimacy in the Age of Enlightenment. By Elizabeth Wahl. Stanford, Calif.: Stanford University Press, 1999. Pp. viii + 358. $49.50 (cloth). - Sex and the Gender Revolution. Vol. 1: Heterosexuality and the Third Gender in Enlightenment London. By Randolph Trumbach. Chicago: University of Chicago Press, 1998. Pp. xiv + 509. $35.00 (cloth).