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Rh (who in this case would lie nearly midway between masculinity and femininity) as the most feminine man would be removed from his complement who would be near the extreme of femininity. Although, as I have said, this is conceivable, it is not borne out by experience. Recognising that we have to do here with an empirical law, and trying to observe a wise scientific restraint, we shall do well to avoid speaking as if there were any "force" pulling the two individuals together as if they were puppets; the law is no more than the statement that an identical relation can be made out in each case of maximum sexual attraction. We are dealing, in fact, with what Ostwald termed an "invariant" and Avenarius a "multiponible"; and this is the constant sum formed by the total masculinity and the total femininity in all cases where a pair of living beings come together with the maximum sexual attraction.

In this matter we may neglect altogether the so-called aesthetic factor, the stimulus of beauty. For does it not frequently happen that one man is completely captivated by a particular woman and raves about her beauty, whilst another, who is not the sexual complement of the woman in question, cannot imagine what his friend sees in her to admire. Without discussing the laws of aesthetics or attempting to gather together examples of relative values, it may readily be admitted that a man may consider a woman beautiful who, from the aesthetic standpoint, is not merely indifferent but actually ugly, that in fact pure aesthetics deal not with absolute beauty, but merely with conceptions of beauty from which the sexual factor has been eliminated.

I have myself worked out the law in, at the lowest, many hundred cases, and I have found that the exceptions were only apparent. Almost every couple one meets in the street furnishes a new proof. The exceptions were specially instructive, as they not only suggested but led to the investigation of other laws of sexuality. I myself made special investigations in the following way. I obtained a set of photographs of aesthetically beautiful women of blameless