This edition contains three studies which seem to me to be necessary prolegomena to that analysis of the sexual instinct which must form the chief part of an investigation into the psychology of sex. The first sketches the main outlines of a complex emotional state which is of fundamental importance in sexual psychology; the second, by bringing together evidence from widely different regions, suggests a tentative explanation of facts that are still imperfectly known; the third attempts to show that even in fields where we assume our knowledge to be adequate a broader view of the phenomena teaches us to suspend judgment and to adopt a more cautious attitude. So far as they go, these studies are complete in themselves; their special use, as an introduction to a more comprehensive analysis of sexual phenomena, is that they bring before us, under varying aspects, a characteristic which, though often ignored, is of the first importance in obtaining a clear understanding of the facts: the tendency of the sexual impulse to appear in a spontaneous and to some extent periodic manner, affecting women differently from men. This is a tendency which, later, I hope to make still more apparent, for it has practical and social, as well as psychological, implications. Here—and more especially in the study of those spontaneous solitary manifestations which I call auto-erotic—I have attempted to clear the ground, and to indicate the main lines along which the progress of our knowledge in these fields may best be attained.

English psychologist Havelock Ellis played an instrumental role in shaping many of our modern ideas about sexuality, gender, and sexual preferences. He dedicated his career to researching then-taboo subjects such as homosexuality and deviant sexual behaviors. This comprehensive volume collects the most pertinent findings from the first phase of Ellis' tenure as a researcher.

Studies in the Psychology of Sex, Volume 2 Havelock Ellis - It has been remarked by Professor Wilhelm Ostwald that the problem of homosexuality is a problem left over to us by the Middle Ages, which for five hundred years dealt with inverts as it dealt with heretics and witches. To regard the matter thus is to emphasize its social and humanitarian interest rather than its biological and psychological significance. It is no doubt this human interest of the question of inversion, rather than its scientific importance, great as the latter is, which is mainly responsible for the remarkable activity with which the study of homosexuality has been carried on during recent years.The result has been that, during the fourteen years that have passed since the last edition of this Study was issued, so vast an amount of work has been carried on in this field that the preparation of a new edition of the book has been a long and serious task. Nearly every page has been rewritten or enlarged and the Index of Authors consulted has more than doubled in length. The original portions of the book have been still more changed; sixteen new Histories have been added, selected from others in my possession as being varied, typical, and full.These extensive additions to the volume have rendered necessary various omissions. Many of the shorter and less instructive Histories contained in earlier editions have been omitted, as well as three Appendices which no longer seem of sufficient interest to retain. In order to avoid undue increase in the size of this volume, already much larger than in the previous editions, a new Study of Eonism, or sexo-esthetic inversion, will be inserted in vol. v, where it will perhaps be at least as much in place as here.