For this state of things, those preachers of morality are to blame who persuade themselves that the only cure for the evil is a still stricter maintenance of the claims of monogamy. They are afraid of any mention of the wealth of varied experience, of the longing for happiness, or the joy of life. They proclaim nothing but the sense of duty, responsibility for one’s individual soul, and obligations to society. But this has been constantly preached from the dawn of Christianity, and yet the standard of sexual morality as a whole is no higher than it was. This gives food for reflection. The more so when this dread of love is carried as far as Tolstoy’s—or rather, the Oriental world’s—detestation of the senses; when marriage is regarded solely as a palliative for a hereditary disease, which ought rather to be stamped out so as to render the remedy unnecessary. When psychical phenomena have been as much investigated as physical, love will also receive its cumatology—that is, its science of waves. We shall follow the curves of the emotions through the ages, their movement of rise and fall, the oppositions and side-influences by which they have been determined. Such a rising wave in our time is the growing detestation of young men for socially protected immorality, their longing for singleness in love. An opposing influence, again, is the disinclination of many young women for love. They are not content, like the neo-Protestant clergymen, with demanding that carnality shall be sanctified by marriage: they want to kill it. They do not merely hate—and with reason—desire apart from love: they depreciate love itself, even when it appears as the unity of soul and senses. According to them, marriage ought to be merely the highest form of sympathetic friendship, in conjunction with a sense of duty directed to the procreation and rearing of children. When marriage is freed from feelings of carnal pleasure as well as from claims of personal happiness, when it is the union of two friends in the duty and joy of living entirely for their children—then alone will it become “moral”!