Medically, MEN differed from WOMEN by being hotter and drier; in the womb, “insufficient accumulation of heat produced a female” (Corbeill 1997:108). Men could become EFFEMINATE, becoming cooler and wetter (Brown 1988:10-11). PLATO conjectured that the first humans were all males, but those who were effeminate by nature became, in the second incarnation, women and wives of true males (Ti. 90-91a). Aristotle characterizes a woman as a “male that does not produce seed” (ágonon árrên; Gen. An. 728a18).