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.
It was indeed the failure to understand the vital activity of the semen and the feminine genital canal, co-operating together towards the junction of sperm cell and germ cell, which for so long stood in the way of the proper understanding of conception. Even the genius of Harvey, which had grappled successfully with the problem of the circulation, failed in the attempt to comprehend the problem of generation. Mainly on account of this difficulty, he was unable to see how the male element could possibly enter the uterus, although he devoted much observation and study to the question. Writing of the uterus of the doe after copulation, he says: "I began to doubt, to ask myself whether the semen of the male could by any possibility make its way by attraction or injection to the seat of conception, and repeated examination led me to the conclusion that none of the semen reached this seat." (De-Generatione Animalium, Exercise lxvii.) "The woman," he finally concluded, "after contact with the spermatic fluid in coitu, seems to receive an influence and become fecundated without the co-operation of any sensible corporeal agent, in the same way as iron touched by the magnet is endowed with its powers."
Although the specifically sexual muscular process of detumescence in women—as distinguished from the general muscular phenomena of sexual excitement which may be fairly obvious—is thus seen to be somewhat complex and obscure, in women as well as in men detumescence is a convulsion which discharges a slowly accumulated store of nervous force. In women also, as in men, the motor discharge is directed to a specific end—the intromission of the semen in the one sex, its reception in the other. In both sexes the sexual orgasm and the pleasure and satisfaction associated with it, involve, as their most essential element, the motor activity of the sexual sphere.[[121]]
The active co-operation of the female organs in detumescence is probably indicated by the difficulty which is experienced in achieving conception by the artificial injection of semen. Marion Sims stated in 1866, in Clinical Notes on Uterine Surgery, that in 55 injections in six women he had only once been successful; he believed that that was the only case at that time on record. Jacobi had, however, practiced artificial fecundation in animals (in 1700) and John Hunter in man. See Gould and Pyle, Anomalies and Curiosities of Medicine, p. 43; also Janke (Die Willkürliche Hervorbringen des Geschlechts, pp. 230 et seq.) who discusses the question of artificial fecundation and brings together a mass of data.
The facial expression when tumescence is completed is marked by a high degree of energy in men and of loveliness in women. At this moment, when the culminating act of life is about to be accomplished, the individual thus reaches his supreme state of radiant beauty. The color is heightened, the eyes are larger and brighter, the facial muscles are more tense, so that in mature individuals any wrinkles disappear and youthfulness returns.
At the beginning of detumescence the features are frequently more discomposed. There is a general expression of eager receptivity to sensory impressions. The dilatation of the pupils, the expansion of the nostrils, the tendency to salivation and to movements of the tongue, all go to make up a picture which indicates an approaching gratification of sensory desires; it is significant that in some animals there is at this moment erection of the ears.[[122]] There is sometimes a tendency to utter broken and meaningless words, and it is noted that sometimes women have called out on their mothers.[[123]] The dilatation of the pupils produces photophobia, and in the course of detumescence the eyes are frequently closed from this cause. 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.[[124]]
The facial expression which marks the culmination of tumescence, and the approach of detumescence is that which is generally expressive of joy. In an interesting psycho-physical study of the emotion of joy, Dearborn thus summarizes its characteristics: "The eyes are brighter and the upper eyelid elevated, as also are the brows, the skin over the glabella, the upper lip and the corners of the mouth, while the skin at the outer canthi of the eye is puckered. The nostrils are moderately dilated, the tongue slightly extended and the cheeks somewhat expanded, while in persons with largely developed pinnal muscles the ears tend somewhat to incline forwards. The whole arterial system is dilated, with consequent blushing from this effect on the dermal capillaries of the face, neck, scalp and hands, and sometimes more extensively even; from the same cause the eyes slightly bulge. The whole glandular system likewise is stimulated, causing the secretions,—gastric, salivary, lachrymal, sudoral, mammary, genital, etc.—to be increased, with the resulting rise of temperature and increase in the katobolism generally. Volubility is almost regularly increased, and is, indeed, one of the most sensitive and constant of the correlations in emotional delight.... Pleasantness is correlated in living organisms by vascular, muscular and glandular extension or expansion, both literal and figurative." (G. Dearborn, "The Emotion of Joy," Psychological Review Monograph Supplements, vol. ii, No. 5, p. 62.) All these signs of joy appear to occur at some stage of the process of sexual excitement.
In some monkeys it would seem that the muscular movement which in man has become the smile is the characteristic facial expression of sexual tumescence or courtship. Discussing the facial expression of pleasure in children, S. S. Buckman has the following remarks: "There is one point in such expression which has not received due consideration, namely, the raising of lumps of flesh each side of the nose as an indication of pleasure. Accompanying this may be seen small furrows, both in children and adults, running from the eyes somewhat obliquely towards the nose. What these characters indicate may be learned from the male mandril, whose face, particularly in the breeding season, shows colored fleshy prominences each side of the nose, with conspicuous furrows and ridges. In the male mandril these characters have been developed because, being an unmistakable sign of sexual ardor, they gave the female particular evidence of sexual feelings. Thus such characters would come to be recognized as habitually symptomatic of pleasurable feelings. Finding similar features in human beings, and particularly in children, though not developed in the same degree, we may assume that in our monkey-like ancestors facial characters similar to those of the mandril were developed, though to a less extent, and that they were symptomatic of pleasure, because connected with the period of courtship. Then they became conventionalized as pleasurable symptoms." (S. S. Buckmann, "Human Babies: What They Teach," Nature, July 5, 1900.) If this view is accepted, it may be said that the smile, having in man become a generalized sign of amiability, has no longer any special sexual significance. It is true that a faint and involuntary smile is often associated with the later stages of tumescence, but this is usually lost during detumescence, and may even give place to an expression of ferocity.