Uberall sonsthin Raserei.[[45]]
In this act of conjugation between two individuals of the same species, differentiated each from the other by the characteristics of sex, the active, provocative rôle is allotted to the male, the passive, receptive rôle, to the female. The modest and coy reluctance characteristic alike of the maiden and of the wife, promote an increase of sexual excitement in the opposite sex, and this not only in a man of purely sensual character, whose vanity is stimulated by his being the chosen one among many—a circumstance which, in view of the great dependence of the sexual act upon psychical processes and imaginative influences, is by no means devoid of importance. The woman’s coy reluctance must be overcome by means of a tender strategy before she is willing to grant the final possession of her body; and the act of copulation forms at the same time the conclusion of the physical and mental yearnings of the lover, and the commencement of the new-coming being. There is thus a physiological reason for the advice given by the celebrated surgeon, Ambroise Paré, that a man, before completing coitus, should employ some of the delicate and sensually stimulating manipulations of the earlier stages of courtship, for, he writes, “aucunes femmes ne sont pas si promptes à ce jeu que les hommes.”
The potency for intercourse of the sexually mature man, his capacity for the introduction of the erect penis during the act of copulation, is dependent on the fact that sexual excitement gives rise to a sufficient stimulus which, acting on the erection centre (and presuming that the centre and its afferent and efferent tracts are normal), leads to an increased flow of arterial blood to the penis and a diminished outflow through the veins of that organ, and consequently to its erection. The cerebrum is the organ in which the sensation of libido sexualis, of sexual excitement, has its seat; with this higher centre is connected by means of intercentral nerve tracts a lower, mechanical, reflex centre, situated in the lumbar enlargement of the spinal cord, and presiding over the performance of the act of copulation; it is moreover probable that nerve fibres proceed from the spinal cord direct to the blood vessels of the erectile tissue, by means of which the calibre of these vessels can be lessened or their extensibility diminished. The relation of the erector nerves (nervi erigentes) to the penis is by many physiologists compared to the relation of the vagus nerve to the heart. In the quiescent state the small arteries of the penis and perhaps also the cavernous spaces of that organ are in a state of mean contraction, so that they offer a considerable resistance to the passage of the blood current. When now the nervi erigentes are excited to activity, the hitherto tonically contracted vessels of the penis undergo, according to the school of physiologists just mentioned, relaxation, so that they dilate under the pressure of the blood within their walls, and, the previous resistance to the flow being now removed, the blood pours freely into the cavernous spaces of the penis, and distends these to the uttermost. In this manner erection is effected, rendering possible the insertion of the penis into the genital passage of the female; with the culmination of the sexual act, the semen is ejaculated, the muscles of the prostate and the membranous portion of the urethra together with the ischiocavernosus and bulbocavernosus muscles, all acting strongly and simultaneously.
By the contraction of the muscular apparatus just described, the penis is constricted in the neighborhood of the pubic symphysis, and this further hinders the outflow of the blood from the corpora cavernosa, increasing the intensity of the state of erection of the penis. Should the relaxation of the corpora cavernosa, dependent upon the stimulation of the nervi erigentes, be incomplete, it is not possible for sufficient blood to pass into the cavernous spaces to exercise considerable pressure upon the efferent veins, and thus complete erection fails to occur. If, again, the contraction of the muscular apparatus at the root of the penis is insufficiently vigorous, complete erection likewise fails to occur; the organ becomes semi-erect only, or erect for a period too short to permit of the completion of intercourse.
Since, physiologically speaking, conception is the purpose with which copulation is effected, the ejaculation of the semen must be regarded as the principal object of that act; now in normal conditions, ejaculation takes place only when the penis is fully erect. Associated with the erection of the corpora cavernosa is a swelling of the caput gallinaginis, whereby the orifices of the ejaculatory ducts are directed forwards toward the membranous portion of the urethra, and at the same time the backward passage to the bladder is cut off. By this mechanism, the urethra, which usually serves as the canal for the outflow of urine, is made for the time being solely subservient to the purposes of the sexual act. That the outlet from the bladder is obstructed by the swollen caput gallinaginis when the penis is erect, is shown by the familiar fact that a man whose penis is erect cannot pass water, although the way is freely open for the ejaculation of the semen.
Before ejaculation begins, the urethral glands already begin to secrete; and when erection is powerful and prolonged, this secretion often makes its appearance at the urethral orifice in the form of drops of a clear somewhat tenacious fluid. Ultzmann considers that the function of this secretion is probably to moisten the walls of the urethra, over which the acid urinary secretion is continually flowing, with a protective alkaline fluid, and thus to prepare the canal for the passage of the semen. An analogy may be found in the secretion of the cervical glands of the uterus in the female, for this secretion has been found to enhance the activity of the movements of the spermatozoa. If now during copulation the moment of ejaculation begins, the male experiences at the same time a sense of voluptuous pleasure and a feeling of muscular spasm in the perineal region, and this indicates the commencing evacuation of the contents of the seminal vesicles through the ejaculatory ducts. Simultaneously, the secretion of the prostate is poured into the urethra. The semen now gradually passes out through the narrow ejaculatory ducts, and, since in consequence of the swelling of the caput gallinaginis, it cannot pass backwards towards the bladder, it runs forwards, and accumulates in the bulb of the urethra, the physiological excavation of that tube. As soon as a considerable quantity of the semen has collected in this situation, so that the bulb of the urethra becomes distended, reflex contractions of the bulbocavernosus muscles ensue, by means of which the seminal fluid is forced out of the urethral orifice. In cases in which this muscular apparatus does not function properly, as in the paralytic form of impotence, the semen during ejaculation is not ejected in a forcible jet, but rather flows slowly, as from a lax tube partially filled with fluid, from the urethral orifice.
We are indebted to Roubaud for a classical description of the phenomena of copulation, and this description is here appended. It runs as follows: “As soon as the penis enters the vaginal vestibule, it first of all pushes against the glans clitoridis, which yields and bends before it. After this preliminary stimulation of the two chief centres of sexual sensibility, the glans penis glides over the inner surfaces of the two vaginal bulbs; the collum and the body of the penis are then grasped between the projecting surfaces of the vaginal bulbs, but the glans penis itself, which has passed further onward, is now in contact with the fine and delicate surface of the vaginal mucous membrane, which membrane itself, owing to the presence of erectile tissue between its layers, is now in an elastic, resilient condition. This elasticity, which enables the vagina to adapt itself to the size of the penis, increases at once the turgescence and the sensibility of the clitoris, inasmuch as the blood that is driven out of the vessels of the vaginal wall passes thence to those of the vaginal bulbs and the clitoris. On the other hand, the turgescence and the sensitiveness of the glans penis itself are heightened by compression of that organ, in consequence of the ever increasing fulness of the vessels of the vaginal mucous membrane and the two vaginal bulbs.
“At the same time the clitoris is pressed downward by the anterior portion of the compressor muscle, so that it is brought into contact with the dorsal surface of the glans and of the body of the penis; in this way a reciprocal friction between these two organs takes place, repeated at each copulatory movement made by the two parties to the action, until at length the voluptuous sensation rises to its highest intensity and culminates in the sexual orgasm, marked in the male by the ejaculation of the seminal fluid, and in the female by the aspiration of that fluid into the gaping external orifice of the cervical canal; so true, indeed, is this, that it is a difficult matter to give a picture at once accurate and complete of the phenomena attending the normal act of copulation. Whilst in one individual the sense of sexual pleasure amounts to no more than a barely perceptible titillation, in another that sense reaches the acme of both mental and physical exaltation.
“Between these two extremes we meet with innumerable states of transition. In cases of intense exaltation, various pathological symptoms make themselves manifest, such as quickening of the general circulation, and violent pulsation of the arteries; the venous blood, being retained in the larger vessels by general muscular contractions, leads to an increased warmth of the body; and further, this venous stagnation, which is still more marked in the brain in consequence of the contraction of the cervical muscles and the backward flexion of the neck, may cause cerebral congestion, during which the consciousness and all mental manifestations are momentarily in abeyance. The eyes, reddened by injection of the conjunctiva, become fixed, and the expression becomes vacant; lids close conclusively, to exclude the light. In some, the breathing becomes panting and labouring; but in others, it is temporarily suspended, in consequence of laryngeal spasm, and the air, after being pent up for a time in the lungs, is finally forcibly expelled, and they utter incoherent and incomprehensible words.”
The impulses proceeding from the congested nerve-centres are confused. There is an indescribable disorder both of motion and of sensation, the extremities are affected with convulsive twitchings, and may be either moved in various directions or extended straight and stiff; the jaws are pressed together so that the teeth grind against each other; and certain individuals are affected by erotic delirium to such as an extent that they will seize the unguarded shoulder, for instance, of their partner in the sexual act, and bite it till the blood flows.