STUDIES IN THE PSYCHOLOGY OF SEX, VOLUME V Erotic Symbolism The Mechanism of Detumescence The Psychic State in Pregnancy by HAVELOCK ELLIS 1927 PREFACE. 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, as in exhibitionism--it has come about by causes congenital, acquired, or both, that some object or class of objects, some act or group of acts, has acquired a dynamic power over the psycho-physical mechanism of the sexual process, deflecting it from its normal adjustment to the whole of a beloved person of the opposite sex. There has been a transmutation of values, and certain objects, certain acts, have acquired an emotional value which for the normal person they do not possess. Such objects and acts are properly, it seems to me, termed symbols, and that term embodies the only justification that in most cases these manifestations can legitimately claim. "The Mechanism of Detumescence" brings us at last to the final climax for which the earlier and more prolonged stage of tumescence, which has occupied us so often in these _Studies_, is the elaborate preliminary. "The art of love," a clever woman novelist has written, "is the art of preparation." That "preparation" is, on the physiological side, the production of tumescence, and all courtship is concerned in building up tumescence. But the final conjugation of two individuals in an explosion of detumescence, thus slowly brought about, though it is largely an involuntary act, is still not without its psychological implications and consequences; and it is therefore a matter for regret that so little is yet known about it. The one physiological act in which two individuals are lifted out of all ends that center in self and become the instrument of those higher forces which fashion the species, can never be an act to be slurred over as trivial or unworthy of study.