The essentially motor character of detumescence is well shown by the extreme forms of erotic intoxication which sometimes appear as the result of sexual excitement. Féré, who has especially called attention to the various manifestations of this condition, presents an instructive case of a man of neurotic heredity and antecedents, in whom it occasionally happened that sexual excitement, instead of culminating in the normal orgasm, attained its climax in a fit of uncontrollable muscular excitement. He would then sing, dance, gesticulate, roughly treat his partner, break the objects around him, and finally sink down exhausted and stupefied. (Féré, L'Instinct Sexuel, Chapter X.) In such a case a diffused and general detumescence has taken the place of the normal detumescence which has its main focus in the sexual sphere.
The same relationship is shown in a case of impotence accompanied by cramps in the calves and elsewhere, which has been recorded by Brügelmann ("Zur Lehre vom Perversen Sexualismus," Zeitschrift für Hypnotismus, 1900, Heft I). These muscular conditions ceased for several days whenever coitus was effected.
An instructive analogy to the motor irradiations preceding the moment of sexual detumescence may be found in the somewhat similar motor irradiations which follow the delayed expulsion of a highly distended bladder. These sometimes become very marked in a child or young woman unable to control the motor system absolutely. The legs are crossed, the foot swung, the thighs tightly pressed together, the toes curled. The fingers are flexed in rhythmic succession. The whole body slowly twists as though the seat had become uncomfortable. It is difficult to concentrate the mind; the same remark may be automatically repeated; the eyes search restlessly, and there is a tendency to count surrounding objects or patterns. When the extreme degree of tension is reached it is only by executing a kind of dance that the explosive contraction of the bladder is restrained.
The picture of muscular irradiation presented under these circumstances differs but slightly from that of the onset of detumescence. In one case the explosion is sought, in the other case it is dreaded; but in both cases there is a retarded muscular tension,—in the one case involuntary, in the other case voluntary—maintained at a point of acute intensity, and in both cases the muscular irradiations of this tension spread over the whole body.
The increased motor irritability of the state of detumescence somewhat resembles the conditions produced by a weak anæsthetic and there is some interest in noting the sexual excitement liable to occur in anæsthesia. I am indebted to Dr. J. F. W. Silk for some remarks on this point:—
"I. Sexual emotions may apparently be aroused during the stage of excitement preceding or following the administration of any anæsthetic; these emotions may take the form of mere delirious utterances, or may be associated with what is apparently a sexual orgasm. Or reflex phenomena connected with the sexual organs may occasionally be observed under special circumstances; or, to put it in another way, such reflex possibilities are not always abolished by the condition of narcosis or anæsthesia.
"II. Of the particular anæsthetics employed I am inclined to think that the possibility of such conditions arising is inversely proportionate to their strength, e.g., they are more frequently observed with a weak anæsthetic like nitrous oxide than with chloroform.
"III. Sexual emotions I believe to be rarely observable in men, and this is remarkable, or, I should say, particularly noticeable, for the presence of nurses, female students, etc., might almost have led one to expect that the contrary would have been the case. On the other hand, it is among men that I have frequently observed a reflex phenomenon which has usually taken the shape of an erection of the penis when the structures in the neighborhood of the spermatic cord have been handled.
"IV. Among females the emotional sexual phenomena most frequently obtrude themselves, and I believe that if it were possible to induce people to relate their dreams they would very often be found to be of a sexual character."