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.[114] 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 à bon escient."[115] The tendency to trembling, constriction of throat, sneezing, emission of internal gas, and the other similar phenomena occasionally associated with detumescence, are likewise due to diffusion of the motor disturbance. Even in infancy the motor signs of sexual excitement are the most obvious indications of orgasm; thus West, describing masturbation in a child of six or nine months who practiced thigh-rubbing, states that when sitting in her high chair she would grasp the handles, stiffen herself, and stare, rubbing her thighs quickly together several times, and then come to herself with a sigh, tired, relaxed, and sweating, these seizures, which lasted one or two minutes, being mistaken by the relations for epileptic fits.[116] 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."
Much more important than the general motor phenomena, more purposive though involuntary, are the specifically sexual muscular movements. From the very beginning of detumescence, indeed, muscular activity makes itself felt, and the peripheral muscles of sex act, according to Kobelt's expression, as a peripheral sexual heart. In the male these movements are fairly obvious and fairly simple. It is required that the semen should be expressed from the vesiculæ seminales, propelled along the urethra, in combination with the prostatic fluid which is equally essential, and finally ejected with a certain amount of force from the urethral orifice. Under the influence of the stimulation furnished by the contact and friction of the vagina, this process is effectively carried out, mainly by the rhythmic contractions of the bulbo-cavernosus muscle, and the semen is emitted in a jet which may be ejaculated to a distance varying from a few centimeters to a meter or more.
With regard to the details of the psychic sides of this process a correspondent, a psychologist, writes as follows:-- "I have never noticed in my reading any attempt to analyze the sensations which accompany the orgasm, and, as I have made a good many attempts to make such an analysis myself, I will append the results on the chance that they may be of some value. I have checked my results so far as possible by comparing them with the experience of such of my friends as had coitus frequently and were willing to tell me as much as they could of the psychology of the process.
"The first fact that I hit upon was the importance of pressure. As one of my informants picturesquely phrases it--'the tighter the fit the greater the pleasure.' This agrees, too, with their unanimous testimony that the pleasurable sensations were much greater when the orgasm occurred simultaneously in the man and woman. Their analysis seldom went further than this, but a few remarked that the distinctive sensations accompanying the orgasm seem to begin near the root of the penis or in the testes, and that they are qualitatively different from the tickling sensations which precede them.
"These tickling sensations are caused, I think, by the friction of the glands against the vaginal walls, and are supplemented by other sensations from the urethra, whose nerves are stimulated by pressure of the vaginal walls and sphincter. The specific sensation of the orgasm begins, I believe, with a strong contraction of the muscles of the urethral walls along the entire length of the canal, and is felt as a peculiar ache starting from the base of the penis and quickly becoming diffused through the whole organ. This sensation reaches its climax with the expulsion of the semen into the urethra and the consequent feeling of distention, which is instantly followed by the rhythmic peristaltic contractions of the urethral muscles which mark the climax of the orgasm.
"The most careful introspection possible under the circumstances seems to show that these sensations arise almost wholly from the urethra and in a far less degree from the corona. During periods of great sexual excitement the nerves of the urethra and corona seem to possess a peculiar sensitivity and are powerfully stimulated by the violent peristaltic contractions of the muscles in the urethral walls during ejaculation. It seems possible that the intensity and volume of sensation felt at the glans may be due in part to the greater area of sensitive surface presented in the fossa as well as to the sensitivity of the corona, and in part to the fact that during the orgasm the glans is more highly congested than at any other time, and the nerve endings thus subjected to additional pressure.
"If the foregoing statements are true, it is easy to see why the pleasure of the man is much increased when the orgasm occurs at the same time in his partner and himself, for the contractions of the vagina upon the penis would increase the stimulation of all the nerve endings in that organ for which a mechanical stimulus is adequate, and the prominence of the corpus spongiosum and corona would ensure them the greatest stimulation. It seems not improbable that the specific sensation of orgasm rises from the stimulation of the peculiar form of nerve end-bulbs which Krause found in the corpus spongiosum and in the glans.
"The characteristic massiveness of the experience is probably due largely to the great number of sensations of strain and pressure caused by the powerful reflex contraction of so many of the voluntary muscles.
"Of course, the foregoing analysis is purely tentative, and I offer it only on the chance that it may suggest some line of inquiry which may lead to results of value to the student of sexual psychology."
In man the whole process of detumescence, when it has once really begun, only occupies a few moments. It is so likewise in many animals; in the genera Bos, Ovis, etc., it is very short, almost instantaneous, and rather short also in the Equidæ (in a vigorous stallion, according to Colin, ten to twelve seconds). As Disselhorst has pointed out, this is dependent on the fact that these animals, like man, possess a vas deferens which broadens into an ampulla serving as a receptacle which holds the semen ready for instant emission when required. On the other hand, in the dog, cat, boar, and the Canidæ, Felidæ, and Suidæ generally, there is no receptacle of this kind, and coitus is slow, since a longer time is required for the peristaltic action of the vas to bring the semen to the urogenital sinus. (R. Disselhorst, _Die Accessorischen Geschlechtsdrusen der Wirbelthiere_, 1897, p. 212.)
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.
A non-medical correspondent in Australia, W.J. Chidley, from whom I have received many communications on this subject, is strongly of opinion from his own observations that not only does the uterus take an active part in coitus, but that under natural conditions the vagina also plays an active part in the process. He was led to suspect such an action many years ago, as well by an experience of his own, as also by hearing from a young woman who met her lover after a long absence that by the excitement thus aroused a tape attached to the underclothes had been drawn into the vagina. Since then the confidences of various friends, together with observations of animals, have confirmed him in the view that the general belief that coitus must be effected by forcible entry of the male organ into a passive vagina is incorrect. He considers that under normal circumstances coitus should take place but rarely, and then only under the most favorable circumstances, perhaps exclusively in spring, and, most especially, only when the woman is ready for it. Then, when in the arms of the man she loves, the vagina, in sympathy with the active movements of the womb, becomes distended at the touch of the turgescent, but not fully erect, penis, "flashes open and draws in the male organ." "All animals," he adds, "have sexual intercourse by the male organ being _drawn_, not forced, into the female. I have been borne out in this by friends who have seen horses, camels, mules and other large animals in the coupling season. What is more absurd, for instance, than to say that an entire _penetrates_ the mare? His penis is a sensitive, beautiful piece of mechanism, which brings its light head here and there till it touches the right spot, when the mare, _if ready_, takes it in. An entire's penis could not penetrate anything; it is a curve, a beautiful curve which would easily bend. A bull's, again, is turned down at the end and, more palpably still, would fold on itself if pressed with force. The womb and vagina of a beautiful and healthy woman constitute a living, vital, moving organ, sensitive to a look, a word, a thought, a hand on the waist."
A well-known American author thus writes in confirmation of the foregoing view: "In nature the woman wooes. When impassioned her vagina becomes erect and dilated, and so lubricated with abundant mucus to the lips that entrance is easy. This dilatation and erectile expansion of vagina withdraws the hymen so close to the walls that penetration need not tear it or cause pain. The more muscular, primitive and healthy the woman the tougher and less sensitive the hymen, and the less likely to break or bleed. I think one great function of the foreskin also is to moisten the glans, so that it can be lubricated for entrance, and then to retract, moist side out, to make entrance still easier. I think that in nature the glans penetrates within the labia, is withstood a moment, vibrating, and then all resistance is withdrawn by a sudden 'flashing open' of the gates, permitting easy entrance, and that the sudden giving up of resistance, and substitution of welcome, with its instantaneous deep entrance, causes an almost immediate male orgasm (the thrill being irresistibly exciting). Certainly this is the process as observed in horses, cattle, goats, etc., and it seems likely something analogous is natural in man."
While it is easily possible to carry to excess a view which would make the woman rather than the man the active agent in coitus (and it may be recalled that in the Cebidæ the penis, as also the clitoris, is furnished with a bone), there is probably an element of truth in the belief that the vagina shares in the active part which, there can now be little doubt, is played by the uterus in detumescence. Such a view certainly enables us to understand how it is that semen effused on the exterior sexual organs can be conveyed to the uterus.