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The genital act, as Vaschide and Vurpas remark, consists essentially in "a more and more marked tension of the motor state which, reaching its maximum, presents a short tonic phase, followed by a clonic phase, and terminates in a period of adynamia and repose."
Féré, Pathologie des Emotions, p. 51. This is an instinctive impulse under all strong emotion in primitive persons. Vaschide and Vurpas, Archives de Neurologie, May, 1904. F.B. Robinson, New York Medical Journal, March 11, 1893.
At the beginning of sexual excitement, Vaschide and Vurpas have observed, tonicity of the eye-muscles seems to increase; the elevators of the upper lids contract, so that the eyes look larger and their mobility and brightness are heightened; with the increase of muscular tonicity strabismus occurs, owing to the greater strength of the muscles that carry the eyes inward.
The tendency to closure of the eyes noted by Roubaud, to avoid contact of the light, indicates dilatation of the pupils, for which we need not seek other explanation than the general tendency of all peripheral stimulation, according to Schiff's law, to produce such dilatation. Vaschide and Vurpas, "Du Coefficient Sexuel de l'Impulsion Musicale," Archives de Neurologie, May, 1904.
The individual, that is to say, who is organically most apt to manifest the physiological activities which mainly make up the process of detumescence, is most likely to be of pronounced erotic temperament. "Erotic persons are of motor type," remark Vaschide and Vurpas, "and we may say generally that nearly all persons of motor type are erotic."
The motor activity is general as well as specifically sexual. There is a general tendency to more or less involuntary movement, without any increase of voluntary muscular power, which is, indeed, decreased, and Vaschide and Vurpas state that dynamometric results are somewhat lower than normal during sexual excitement, and the variations greater. The tendency to diffused activity of involuntary muscle is well illustrated by the contraction of the bladder associated with detumescence. While this occurs in both sexes, in men erection produces a mechanical impediment to any evacuation of the bladder. In women there is not only a desire to urinate but, occasionally, actual urination. Many quite healthy and normal women have, as a rare accident supervening on the coincidence of an unusually full bladder with an unusual degree of sexual excitement, experienced a powerful and quite involuntary evacuation of the bladder at the moment of orgasm. In women with less normal nervous systems this has, more rarely, been almost habitual. Brantôme has perhaps recorded the earliest case of this kind in referring to a lady he knew who "quand on lui faisait cela elle se compissait
This is indicated, so far as the very marked increase of blood-pressure is concerned, by some observations made by Vaschide and Vurpas with the sphygmanometer on a lady under the influence of sexual excitement. In this case there was a relationship of sympathy and friendly tenderness between the experimenter and the subject, Madame X, aged 25.
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