CHAPTER IX.—SEXUAL MORALITY. Prostitution in Relation to Our Marriage System—Marriage and Morality—The Definition of the Term "Morality"—Theoretical Morality—Its Division Into Traditional Morality and Ideal Morality—Practical Morality—Practical Morality Based on Custom—The Only Subject of Scientific Ethics—The Reaction Between Theoretical and Practical Morality—Sexual Morality in the Past an Application of Economic Morality—The Combined Rigidity and Laxity of This Morality—The Growth of a Specific Sexual Morality and the Evolution of Moral Ideals—Manifestations of Sexual Morality—Disregard of the Forms of Marriage—Trial Marriage—Marriage After Conception of Child—Phenomena in Germany, Anglo-Saxon Countries, Russia, etc.—The Status of Woman—The Historical Tendency Favoring Moral Equality of Women with Men—The Theory of the Matriarchate—Mother-Descent—Women in Babylonia—Egypt—Rome—The Eighteenth and Nineteenth Centuries—The Historical Tendency Favoring Moral Inequality of Woman—The Ambiguous Influence of Christianity—Influence of Teutonic Custom and Feudalism—Chivalry—Woman in England—The Sale of Wives—The Vanishing Subjection of Woman—Inaptitude of the Modern Man to Domineer—The Growth of Moral Responsibility in Women—The Concomitant Development of Economic Independence—The Increase of Women Who Work—Invasion of the Modern Industrial Field by Women—In How Far This Is Socially Justifiable—The Sexual Responsibility of Women and Its Consequences—The Alleged Moral Inferiority of Women—The "Self-Sacrifice" of Women—Society Not Concerned with Sexual Relationships—Procreation the Sole Sexual Concern of the State—The Supreme Importance of Maternity.