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28 some one appears who seems so desirable that everything in the world is worthless and empty compared with union with such a one. What are the qualifications of that person? What are his or her peculiarities? If it really be the case—and I think it is—that every male type has its female counterpart with regard to sexual affinity, it looks as if there were some definite law. What is this law? How does it act? "Like poles repel, unlike attract," was what I was told when, already armed with my own answer, I resolutely importuned different kinds of men for a statement, and submitted instances to their power of generalisation. The formula, no doubt, is true in a limited sense and for a certain number of cases. But it is at once too general and too vague; it would be applied differently by different persons, and it is incapable of being stated in mathematical terms.

This book does not claim to state all the laws of sexual affinity, for there are many; nor does it pretend to be able to tell every one exactly which individual of the opposite sex will best suit his taste, for that would imply a complete knowledge of all the laws in question. In this chapter only one of these laws will be considered—the law which stands in organic relation to the rest of the book. I am working at a number of other laws, but the following is that to which I have given most investigation, and which is most elaborated. In criticising this work, allowance must be made for the incomplete nature of the material consequent on the novelty and difficulty of the subject.

Fortunately it is not necessary for me to cite at length either the facts from which I originally derived this law of sexual affinity or to set out in detail the evidence I obtained from personal statements. I asked each of those who helped me, to make out his own case first, and then to carry out observations in his circle of acquaintances. I have paid special attention to those cases which have been notice and remembered, in which the taste of a friend has not been understood, or appeared not to be present, or was different from that of the observer. The minute degree of knowledge of the external form of the human body which