In man there can be little doubt that detumescence is more rapidly accomplished in the European than in the East, in India, among the yellow races, or in Polynesia. This is probably in part due to a deliberate attempt to prolong the act in the East, and in part to a greater nervous erethism among Westerns.
In the woman the specifically sexual muscular process is less visible, more obscure, more complex, and uncertain. Before detumescence actually begins there are at intervals involuntary rhythmic contractions of the walls of the vagina, seeming to have the object of at once stimulating and harmonizing with those that are about to begin in the male organ. It would appear that these rhythmic contractions are the exaggeration of a phenomenon which is normal, just as slight contraction is normal and constant in the bladder. Jastreboff has shown, in the rabbit, that the vagina is in constant spontaneous rhythmic contraction from above downward, not peristaltic, but in segments, the intensity of the contractions increasing with age and especially with sexual development. This vaginal contraction which in women only becomes well marked just before detumescence, and is due mainly to the action of the sphincter cunni (analogous to the bulbo-cavernosus in the male), is only a part of the localized muscular process. At first there would appear to be a reflex peristaltic movement of the Fallopian tubes and uterus. Dembo observed that in animals stimulation of the upper anterior wall of the vagina caused gradual contraction of the uterus, which is erected by powerful contraction of its muscular fiber and round ligaments while at the same time it descends toward the vagina, its cavity becoming more and more diminished and mucus being forced out. In relaxing, Aristotle long ago remarked, it aspirates the seminal fluid.
Although the active participation of the sexual organs in woman, to the end of directing the semen into the womb at the moment of detumescence, is thus a very ancient belief, and harmonizes with the Greek view of the womb as an animal in the body endowed with a considerable amount of activity,[[117]] precise observation in modern times has offered but little confirmation of the reality of this participation. Such observations as have been made have usually been the accidental result of sexual excitement and orgasm occurring during a gynæcological examination. As, however, such a result is liable to occur in erotic subjects, a certain number of precise observations have accumulated during the past century. So far as the evidence goes, it would seem that in women, as in mares, bitches, and other animals, the uterus becomes shorter, broader, and softer during the orgasm, at the same time descending lower into the pelvis, with its mouth open intermittently, so that, as one writer remarks, spontaneously recurring to the simile which commended itself to the Greeks, "the uterus might be likened to an animal gasping for breath."[[118]] This sensitive, responsive mobility of the uterus is, indeed, not confined to the moment of detumescence, but may occur at other times under the influence of sexual emotion.
It would seem probable that in this erection, contraction, and descent of the uterus, and its simultaneous expulsion of mucus, we have the decisive moment in the completion of detumescence in woman, and it is probable that the thick mucus, unlike the earlier more limpid secretion, which women are sometimes aware of after orgasm, is emitted from the womb at this time. This is, however, not absolutely certain. Some authorities regard detumescence in women as accomplished in the pouring out of secretions, others in the rhythmic genital contractions; the sexual parts may, however, be copiously bathed in mucus for an indefinitely long period before the final stage of detumescence is achieved, and the rhythmic contractions are also taking place at a somewhat early period; in neither respect is there any obvious increase at the final moment of orgasm. In women this would seem to be more conspicuously a nervous manifestation than in men. On the subjective side it is very pronounced, with its feeling of relieved tension and agreeable repose—a moment when, as one woman expresses it, together with intense pleasure, there is, as it were, a floating up into a higher sphere, like the beginning of chloroform narcosis—but on the objective side this culminating moment is less easy to define.
Various observations and remarks made during the past two or three centuries by Bond, Valisneri, Dionis, Haller, Günther, and Bischoff, tending to show a sucking action of the uterus in both women and other female animals, have been brought together by Litzmann in R. Wagner's Handwörterbuch der Physiologie (1846, vol. iii, p. 53). Litzmann added an experience of his own: "I had an opportunity lately, while examining a young and very erethic woman, to observe how suddenly the uterus assumed a more erect position, and descended deeper in the pelvis; the lips of the womb became equal in length, the cervix rounded, softer, and more easily reached by the finger, and at the same time a high state of sexual excitement was revealed by the respiration and voice."
The general belief still remained, however, that the woman's part in conjugation is passive, and that it is entirely by the energy of the male organ and of the male sexual elements, the spermatozoa, that conjunction with the germ cell is attained. According to this theory, it was believed that the spermatozoa were, as Wilkinson expresses it, in a history of opinion on this question, "endowed with some sort of intuition or instinct; that they would turn in the direction of the os uteri, wading through the acid mucus of the vagina; travel patiently upward and around the vaginal portion of the uterus; enter the uterus and proceed onward in search of the waiting ovum." (A. D. Wilkinson, "Sterility in the Female," Transactions of the Lincoln Medical Society, Nebraska, 1896.)
About the year 1859 Fichstedt seems to have done something to overthrow this theory by declaring his belief that the uterus was not, as commonly supposed, a passive organ in coitus, but was capable of sucking in the semen during the brief period of detumescence. Various authorities then began to bring forward arguments and observations in the same sense. Wernich, especially, directed attention to this point in 1872 in a paper on the erectile properties of the lower segment of the uterus ("Die Erectionsfahigkeit des untern Uterus-Abschnitts," Beiträge zur Geburtshülfe und Gynäkologie, vol. i, p. 296). He made precise observations and came to the conclusion that owing to erectile properties in the neck of the uterus, this part of the womb elongates during congress and reaches down into the pelvis with an aspiratory movement, as if to meet the glans of the male. A little later, in a case of partial prolapse, Beck, in ignorance of Wernich's theory, was enabled to make a very precise observation of the action of the uterus during excitement. In this case the woman was sexually very excitable even under ordinary examination, and Beck carefully noted the phenomena that took place during the orgasm. "The os and cervix uteri," he states, "had been about as firm as usual, moderately hard and, generally speaking, in a natural and normal condition, with the external os closed to such an extent as to admit of the uterine probe with difficulty; but the instant that the height of excitement was at hand, the os opened itself to the extent of fully an inch, as nearly as my eye can judge, made five or six successive gasps as if it were drawing the external os into the cervix, each time powerfully, and, it seemed to me, with a regular rhythmical action, at the same time losing its former density and hardness and becoming quite soft to the touch. Upon the cessation of the action, as related, the os suddenly closed, the cervix again hardened itself, and the intense congestion was dissipated." (J. R. Beck, "How do the Spermatozoa Enter the Uterus?" American Journal of Obstetrics, 1874.) It would appear that in the early part of this final process of detumescence the action of the uterus is mainly one of contraction and ejaculation of any mucus that may be contained; Dr. Paul Mundé has described "the gushing, almost in jets," of this mucus which he has observed in an erotic woman under a rather long digital and specular examination. (American Journal of Obstetrics, 1893.) It is during the latter part of detumescence, it would seem, and perhaps for a short time after the orgasm is over, that the action of the uterus is mainly aspiratory.
While the active part played by the womb in detumescence can no longer be questioned, it need not too hastily be assumed that the belief in the active movements of the spermatozoa must therefore be denied. The vigorous motility of the tadpole-like organisms is obvious to anyone who has ever seen fresh semen under the microscope; and if it is correct, as Clifton Edgar states, that the spermatozoa may retain their full activity in the female organs for at least seventeen days, they have ample time to exert their energies. The fact that impregnation sometimes occurs without rupture of the hymen is not decisive evidence that there has been no penetration, as the hymen may dilate without rupturing; but there seems no reason to doubt that conception has sometimes taken place when ejaculation has occurred without penetration; this is indicated in a fairly objective manner when, as has been occasionally observed, conception has occurred in women whose vaginas were so narrow as scarcely to admit the entrance of a goose-quill; such was the condition in the case of a pregnant woman brought forward by Roubaud. The stories, repeated in various books, of women who have conceived after homosexual relations with partners who had just left their husbands' beds are not therefore inherently impossible.[[119]] Janke quotes numerous cases in which there has been impregnation in virgins who have merely allowed the penis to be placed in contact with the vulva, the hymen remaining unruptured until delivery.[[120]]
It must be added, however, that even if the semen is effused merely at the mouth of the vagina, without actual penetration, the spermatozoa are still not entirely without any resource save their own motility in the task of reaching the ovum. As we have seen, it is not only the uterus which takes an active part in detumescence; the vagina also is in active movement, and it seems highly probable that, at all events in some women and under some circumstances, such movement favoring aspiration toward the womb may be communicated to the external mouth of the vagina.
Riolan (Anthropographia, 1626, p. 294) referred to the constriction and dilation of the vulva under the influence of sexual excitement. It is said that in Abyssinia women can, when adopting the straddling posture of coitus, by the movements of their own vaginal muscles alone, grasp the male organ and cause ejaculation, although the man remains passive. According to Lorion the Annamites, adopting the normal posture of coitus, introduce the penis when flaccid or only half erect, the contraction of the vaginal walls completing the process; the penis is very small in this people. It is recognized by gynæcologists that the condition of vaginismus, in which there is spasmodic contraction of the vagina, making intercourse painful or impossible, is but a morbid exaggeration of the normal contraction which occurs in sexual excitement. Even in the absence of sexual excitement there is a vague affection, occurring in both married and unmarried women, and not, it would seem, necessarily hysterical, characterized by quivering or twitching of the vulva; I am told that this is popularly termed "flackering of the shape" in Yorkshire and "taittering of the lips" in Ireland. It may be added that quivering of the gluteal muscles also takes place during detumescence, and that in Indian medicine this is likewise regarded as a sign of sexual desire in women, apart from coitus.