This paper defends the view that homosexuality is abnormal and hence undesirable—not because it is immoral or sinful, or because it weakens society or hampers evolutionary development, but for a purely mechanical reason. It is a misuse of bodily parts. Clear empirical sense attaches to the idea of the use of such bodily parts as genitals, the idea that they are for something, and consequently to the idea of their misuse. I argue on grounds involving natural selection that misuse of (...) bodily parts can with high probability be connected to unhappiness. I regard these matters as prolegomena to such policy issues as the rights of homosexuals, the rights of those desiring not to associate with homosexuals, and legislation concerning homosexuality, issues which I shall not discuss systematically here. However, I do in the last section draw a seemingly evident corollary from my view that homosexuality is abnormal and likely to lead to unhappiness. (shrink)

Lecture notes taken by Kant's students of his university courses in ethics.