In the mental life of a sane man, woman is far from filling the part she plays in that of the degenerate. The physiological relation of man to woman is that of desire for the time being toward her, and of indifference when the state of desire is not present. Antipathy, let alone violent enmity, to woman, the normal man never feels. If he desires the woman, he loves her; if his erotic excitement is appeased, he becomes cool and more distant in his attitude, though without feeling aversion or fear. The man, from his purely subjective, physiological necessities and inclinations, would certainly never have invented marriage, the persistent alliance with woman. This is not a sexual but a social arrangement. It does not rest on the organic instincts of the individual man, but on the need of collectivity. It depends on the existing economic order and the dominant opinions about the State, its problems and its relations to the individual, and changes its form with these. A man may--or at least should--choose a certain woman for his consort out of love; but what holds him fast married, after a suitable choice and successful courtship, is no longer physiological love, but a complex mixture of habit, gratitude, unsexual friendship, convenience, the wish to obtain for himself social advantages (to which must naturally be added an ordered household, social representation, etc.), considerations of duty towards children and State; more or less, also, unthinking imitation of a universal observance. But feelings such as are described in the _Kreutzer Sonata_ and in _Family Happiness_ the normal man never experiences towards his wife, even if he has ceased to love her in the natural sense of the word.