During each new phase of the development of love women, probably earlier and certainly more consciously than men, have connected the demand for unity with the idea of love. The sense of unity is quite another and a far later phenomenon than monogamy. The enforced fidelity in monogamy, the voluntary fidelity in love, gave rise in woman first to control of desire, then to the weakening of desire through control. Thus by degrees erotic unity became with many women an organic condition, or, as is significantly said, a physical necessity. Not with all, not even with the majority, but still sufficiently frequently to enable us to call the unity of soul and senses in love—as also a lifelong fidelity in a single love—the provision of nature for innumerable women, while with men both are still exceptions so rarely to be met with that they are often called unnatural. But he who concludes from this that one has only to demand the same of men for the effect to be the same, is attributing the same effect to two different causes. For the erotic conditions of man and woman are and will remain different causes. The purity which a man is capable of attaining must always, therefore, to a certain degree be different from a woman’s, but not on that account of less worth. He will certainly remain more polygamous than she, but this does not involve a division of himself in the satisfaction of his erotic needs. Love possesses, nay, besets, dominates, and determines woman’s whole being in an entirely different way from man’s. He is more strongly possessed at rapidly passing moments, by the erotic emotion, but at the same time he liberates himself more quickly and completely. On the other hand, in the degree in which a woman is womanly, is she completely determined by love. This gives a unity, completeness, and equilibrium to her sensuousness which man lacks. When he is warm, he often believes woman is cool; when he sees her warm, he thinks that she is so in the same way as himself. Women are undoubtedly to be found, shifting, like men, between sudden ardour and abrupt chill, and these women are ever the most exciting erotically. With the majority of women, however, love is, for the reasons already given, a constant warmth, a never-quenched fervour. But this makes the woman suffer through the man, who in the intervals of his passion is so much more tranquil than she, so little capable of her unremitting tenderness. Therefore she seldom finds herself occupying his thoughts and feelings so completely as he occupies hers.