 Probably the most frequent assumption about sexual orientation, at least by ancient Greek authors, is that persons can respond erotically to beauty in either sex. Diogenes Laeurtius, for example, wrote of Alcibiades, the Athenian general and politician of the 5th century B.C., “in his adolescence he drew away the husbands from their wives, and as a young man the wives from their husbands.” (Quoted in Greenberg, 1988, 144) Some persons were noted for their exclusive interests in persons of one gender. For example, Alexander the Great and the founder of Stoicism, Zeno of Citium, were known for their exclusive interest in boys and other men. Such persons, however, are generally portrayed as the exception. Furthermore, the issue of what biological sex one is attracted to is seen as an issue of taste or preference, rather than as a moral issue. A character in Plutarch’s Erotikos (Dialogue on Love) argues that “the noble lover of beauty engages in love wherever he sees excellence and splendid natural endowment without regard for any difference in physiological detail” (ibid., 146). Gender just becomes irrelevant “detail” and instead the excellence in character and beauty is what is most important.