In this volume the terminal phenomena of the sexual process are discussed, before an attempt is finally made, in the concluding volume, to consider the bearings of the psychology of sex on that part of morals which may be called "social hygiene."
Under "Erotic Symbolism" I include practically all the aberrations of the sexual instinct, although some of these have seemed of sufficient importance for separate discussion in previous volumes. It is highly probable that many readers will consider that the name scarcely suffices to cover manifestations so numerous and so varied. The term "sexual equivalents" will seem preferable to some. While, however, it may be fully admitted that these perversions are "sexual equivalents"--or at all events equivalents of the normal sexual impulse--that term is merely a descriptive label which tells us nothing of the phenomena. "Sexual Symbolism" gives us the key to the process, the key that makes all these perversions intelligible. In all of them--very clearly in some, as in shoe-fetichism; more obscurely in others