The Libido Theory
FREUD'S earliest position on sexuality has already been described above, the theory that sexual frustration is the direct cause of neurosis. It is expressed in the aphorism: No neurosis with a normal vita sexualis. This position was first announced around 1895, and reaffirmed several times in the next few years. However, for a long time Freud published nothing concerning sexuality, and was evidently just allowing the mass of clinical experience to be digested. He finally came out in 1905 with the more mature theory, embodied in the Three Essays on Sexuality. This book was revised by Freud many times throughout his lifetime, in contrast to his attitude towards some of his writings which, once published, he never looked at again.