To an ethicist or a moralizer, the happily married man -- or even just a mere married man -- is a ringing affirmation of the proposition that mind and body may be treated independently, as if constituted of entirely different stuff. For a man, answering only the logic of the body and its propagation, would never submit so willingly to such an unnatural abridgment of his own interest and pleasure, were it not under the influence or guidance of the seventh commandment, or some comparable ethical prescription. Natural selection, original sin -- call it what you will. It is assumed to favor unadulterated adulterousness.