The key to the genital apparatus in women from the psychic point of view, and, indeed, to some extent, its anatomical center, is to be found in the clitoris. Anatomically and developmentally the clitoris is the rudimentary analogue of the masculine penis. Functionally, however, its scope is very much smaller. While the penis both receives and imparts specific voluptuous sensations, and is at the same time both the intromittent organ for the semen and the conduit for the urine, the sole function of the clitoris is to enter into erection under the stress of sexual emotion and receive and transmit the stimulatory voluptuous sensations imparted to it by friction with the masculine genital apparatus. It is so insignificant an organ that it is only within recent times that its homology with the penis has been realized. In 1844 Kobelt wrote in his important book, Die Mannlichen und Weiblichen Wollust-Organe, that in his attempt to show that the female organs are exactly analogous to the male the reader will probably be unable to follow him, while even Johannes Müller, the father of scientific physiology, declared at about the same period that the clitoris is essentially different from the penis. It is indeed but three centuries since the clitoris was so little known that (in 1593) Realdus Columbus actually claimed the honor of discovering it. Columbus was not its discoverer, for Fallopius speedily showed that Avicenna and Albucasis had referred to it.[[85]] The Arabs appear to have been very familiar with it, and, from the various names they gave it, clearly understood the important part it plays in generating voluptuous emotion.[[86]] But it was known in classic antiquity; the Greeks called it μύρτον, the myrtle-berry; Galen and Soranus called it νύμφη because it is covered as a bride is veiled, while the old Latin name was tentigo, from its power of entering into erection, and columella, the little pillar, from its shape. The modern term, which is Greek and refers to the sensitiveness of the part to voluptuous titillation, is said to have originated with Suidas and Pollux.[[87]] It was mentioned, though not adopted, by Rufus.
"The clitoris," declared Haller, "is a part extremely sensible and wonderfully prurient." It is certainly the chief though by no means the only point through which the immediate call to detumescence is conveyed to the female organism. It is, indeed, as Bryan Robinson remarks, "a veritable electrical bell button which, being pressed or irritated, rings up the whole nervous system."
The nervous supply of this little organ is very large, and the dorsal nerve of the clitoris is relatively three or four times larger than that of the penis. Yet the sensitive point of this organ is only 5 to 7 millimeters in extent. The length of the clitoris is usually rather over 2 centimeters (or about an inch) and 3 centimeters when erect; a length of 4 centimeters or more was regarded by Martineau as within the normal range of variation. It is not usual to find the clitoris longer than this in Europe (for among some races like the negro the clitoris is generally large), but all degrees of magnitude may be found as rare exceptions. (See, e.g., Sir J. Y. Simpson, "Hermaphrodites," Obstetric Memoirs and Contributions, vol. ii, pp. 217-226; also Dickinson, loc. cit.) It was formerly thought that the clitoris is easily enlarged by masturbation, and Martineau believed that in this way it might be doubled in length. It is probable that slight enlargement of the clitoris may be caused by very frequent masturbation, but only to an insignificant extent, and it is impossible to diagnose masturbation from the size of the clitoris. Among the women of Lake Nyassa, as well as in the Caroline Islands, special methods are practiced for elongating the clitoris, but in Europe, at all events, it is probable that the variations in the size of the organ are mainly congenital. It may well be that a congenitally large clitoris is associated with an abnormally developed excitability of the sexual apparatus. Tilt stated (On Uterine and Ovarian Inflammation, p. 37) that in his experience there was a frequent though not invariable connection between a large clitoris and sexual proclivity. (Schurig referred to a case of intense and life-long sexual obsession associated with an extremely large clitoris, Gynæcologia, pp. 16-17.) Of recent years considerable importance has been attached by some gynecologists (e.g., R. T. Morris, "Is Evolution Trying to Do Away With the Clitoris?" Transactions American Association of Obstetricians and Gynecologists, vol. v, 1893) to preputial adhesions around the clitoris as a source of nervous disturbance and invalidism in young women.
While the clitoris is anatomically analogous to the penis, its actual mechanism under the stress of sexual excitement is somewhat different. As Liétaud long since pointed out, it cannot rise freely in erection as the penis can; it is apparently bound down by its prepuce and its frenulum. Waldeyer, in his book on the pelvis, states more precisely that, unlike the penis, when erect it retains its angle, only this becomes somewhat rounded so that the organ is to some slight extent lifted and protruded. Waldeyer considered that the clitoris was thus perfectly fitted to fulfill its part as the recipient of erotic stimulation from friction by the penis. Adler, however, has pointed out with considerable justice, that this is not altogether the case. The clitoris was developed in mammals who practiced the posterior mode of coitus; in this position the clitoris was beneath the penis, which was thus easily able in coitus to press it against the pubic bone close beneath which it is situated, and thus impart the compression and friction which the feminine organ craves. But in the human anterior mode of coitus it is not necessarily brought into close contact with the penis during the act of coitus, and thus fails to receive powerful stimulation. Its restricted position, which is an advantage in posterior coitus, is a disadvantage in anterior coitus. Adler observes that it thus comes about that the human method of coitus, while by bringing breast to breast and face to face it has added a new dignity and refinement, a fresh source of enjoyment, to the embrace of the sexes, has not been an unmixed advantage to woman, for while man has lost nothing by the change, woman has now to contend with an increased difficulty in attaining an adequate amount of pressure on that "electric button" which normally sets the whole mechanism in operation.[[88]]
We may well bring into connection with the changed conditions brought about by anterior coitus the interesting fact that while the clitoris remains the most exquisitely sensitive of the sexual centers in woman, voluptuous sensitivity is much more widely diffused in woman than in man. Over the whole body, indeed, it is apt to be more distinctly marked than is usually the case in man. But even if we confine ourselves to the genital region, while in man that portion of the penis which enters the vagina, and especially the glans, is normally the only portion which, even during turgescence, is sensitive to voluptuous contacts, in woman the whole of the region comprised within the larger lips, including even the anus and internally the vagina and the vaginal portion of the womb,[[89]] become sensitive to voluptuous contacts. Deprived of the penis the ability of a man to experience specifically sexual sensations becomes very limited indeed. But the loss of the clitoris or of any other structure involves no correspondingly serious disability on women. Ablation of the clitoris for sexual hyperæsthesia has for this reason been abandoned, except under special circumstances. The members of the Russian Skoptzy sect habitually amputate the clitoris, nymphæ, and breasts, yet many young Skoptzy women told the Russian physician, Guttceit, that they were perfectly well able to enjoy coitus.
Freud believes that in very young girls the clitoris is the exclusive seat of sexual sensation, masturbation at this age being directed to the clitoris alone, and spontaneous sexual excitement being confined to twitchings and erection of this organ, so that young girls are able, from their own experience, to recognize without instruction the signs of sexual excitement in boys. At a later age sexual excitability spreads from the clitoris to other regions—just as the easy inflammability of wood sets light to coal—though in the male the penis remains from first to last normally the almost exclusive seat of specific excitability. (S. Freud, Drei Abhandlungen zur Sexualtheorie, p. 62.)
The anus would, however, seem to be sometimes an erogenous zone even at an early age. Titillation of the anus appears to be frequently pleasurable in women; and this is not surprising considering the high degree of erotic sensitivity which is easily developed at the body orifices where skin meets mucous membrane. (Thus the meatus of the urethra is a highly erogenous zone, as is sufficiently shown by the frequency with which hair-pins and other articles used in masturbation find their way into the bladder.) It is in this germinal sensitivity, undoubtedly, that we find a chief key to the practice of pedicatio. Freud attaches great importance to the anus as a sexually erogenous zone at a very early age, and considers that it very frequently makes its influence felt in this respect. He believes that intestinal catarrhs in very early life and hæmorrhoids later tend to develop sensibility in the anus. He finds an indication that the anus has become a sexually erogenous zone when children wish to allow the contents of the rectum to accumulate so that defecation may by its increased difficulty involve voluptuous sensations, and adds that masturbatory excitation of the anus with the fingers is by no means rare in older children. (S. Freud, Op. cit., pp. 40-42.) A medical correspondent in India tells me of a European lady who derived, she said, "quite as much, indeed more," pleasure from digitally titillating her rectum as from vulvo-vaginal titillation; she had several times submitted to pedicatio and enjoyed it, though it was painful during penetration. The anus may retain this erogenous irritability even in old age, and Routh mentions the case of a lady of over 70, the reverse of lustful, who was so excited by the act of defecation that she was invariably compelled to masturbate, although this state of things was a source of great mental misery to her. (C. H. F. Routh, British Gynæcological Journal, February, 1887, p. 48.)
Bölsche has sought the explanation of the erogenous nature of the anus, and the key to pedicatio, in an atavistic return to the very remote amphibian days when the anus was combined with the sexual parts in a common cloaca. But it is unnecessary to invoke any vestigial inheritance from a vastly remote past when we bear in mind that the innervation of these two adjoining regions is inevitably very closely related. The presence of a body exit with its marked and special sensitivity at a point where it can scarcely fail to receive the nervous overflow from an immensely active center of nervous energy quite adequately accounts for the phenomenon in question.
The inner lips, the nymphæ or labia minora, running parallel with the greater lips which enclose them, embrace the clitoris anteriorly and extend backward, enclosing the urethral exit between them as well as the vaginal entrance. They form little wings whence their old Latin name, alæ, and from their resemblance to the cock's comb were by Spigelius termed crista galli. The red and (especially in brunettes) dark appearance of the nymphæ suggests that they are mucous membrane and not integumentary; it is, however, now considered that even on the inner surface they are covered by skin and separated from the mucous membrane by a line.[[90]] In structure, as described by Waldeyer, they consist of fine connective tissue rich in elastic fibers as well as some muscular tissue, and full of large veins, so that they are capable of a considerable degree of turgescence resembling erection during sexual excitement, while Ballantyne finds that the nymphæ are supplied to a notable extent with nervous end-organs.
More than any other part of the sexual apparatus in either sex, the lesser lips, on account of their shape, their position, and their structure, are capable of acquired modifications, more especially hypertrophy and elongation. By stretching, it is stated, a labium can be doubled in its dimensions. The "Hottentot apron," or elongated nymphæ, commonly found among some peoples in South Africa, has long been a familiar phenomenon. In such cases a length or transverse diameter of 3 to 5 centimeters is commonly found. But such elongated nymphæ are by no means confined to one part of the world or to one race; they are quite common among women of European race, and reach a size equal to most of the more reliably recorded Hottentot cases. Dickinson, who has very carefully studied this question in New York, finds that in 1000 consecutive gynæcological cases the labia showed some form of hypertrophy in 36 per cent., or more than 1 in 3; while among 150 of these cases who were neurasthenic, the proportion reached 56 per cent., even when minor or doubtful enlargements were disregarded. Bergh, in about 16 per cent. cases, found very enlarged nymphæ, the height reached in about 5 per cent. of the cases of enlargement being nearly six centimeters. Ploss and Bartels, in a full discussion: of the "Hottentot apron," come to the conclusion that this condition is perhaps in most cases artificially produced. It is known that among the Basutos it is the custom for the elder girls to manipulate the nymphæ of younger children, when alone with them, almost from birth, and on account of the elastic nature of these structures such manipulation quite adequately accounts for the elongation. It is not necessary to suppose that the custom is practiced for the sake of producing sexual stimulation—though this may frequently occur—since there are numerous similar primitive customs involving deformation of the sexual organs without the production of sexual excitement. Dickinson has come to a similar conclusion as regards the corresponding elongation of the nymphæ in civilized European women. In 361 out of 1000 women of good social class he found elongation or thickening, often with a notable degree of wrinkling and pigmentation, and believes that this is always the result of frequently repeated masturbation practiced with the separation of the nymphæ; in 30 per cent. of the cases admission of masturbation was made.[[91]] While this conclusion is probably correct in the main, it requires some qualification. To assert that whenever in women who have not been pregnant the marked protrusion of the inner lips beyond the outer lips means that at some period manipulation has been practiced with or without the production of sexual excitement is to make too absolute a statement. It is highly probable that the nymphæ, like the clitoris, are congenitally more prominent in some of the lower human races, as they are also in the apes; among the Fuegians, for instance, according to Hyades and Deniker, the labia minora descend lower than in Europeans, although there is not the slightest reason to suppose that these women practice any manipulations. Among European women, again, the nymphæ sometimes protrude very prominently beyond the labia majora in women who are organically of somewhat infantile type; this occurs in cases in which we may be convinced that no manipulations have ever been practiced.[[92]]