Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].

And, of course, the pelvic zone has also its part to play, although the results here are of a different pitch and order of sensation. I would refer my readers to Plates L, II. and IV., which show first the possibilities of the Constrictor Cunni and of the outer parts (b) of the Levator. These are supplemented by the parts of the Levator Vaginae, which are situated further inside the body (Plate lie. and Plate IV c.) and gives a further range of action—friction—and sensation. But full sex efficiency in coitus demands advanced proficiency in exercise and also favourable structural conditions; for the genital and pelvic organs in both sexes, and especially women, have a very wide range of individual variation, even apart from actual deformity or abnormality. We have mentioned the contractile possibilities of the pelvic and perivaginal muscles. But it is necessary to contract the C. C. with special force in cases where the woman wishes to help her husband to retain the member in her vagina though his erection is incomplete. In these circumstances the inner parts of Levator Vagince must not be set in motion ; their action would only expel the male organ (if it had indeed any effect). But the outer parts of the Levator Vagince may be of great help by their clipping, almost " snapping," action. The main role, however, must be played by the C. C, whose continuous suction, as described in the experiment recounted in Chapter VI. (a), not only retains the male organ—provided that the erection has not wholly subsided—but also obtains a certain hold on the root of the penis. This has the effect of hindering the backward flow of blood from the congested corpora cavernosa and gives the clasping C. C. muscle still more purchase. And these combined and interacting processes have often great value in coital technique, and, a^s a result, in its emotional, mental and hygienic irradiations. In normal coitus the too rapid ebb of the man's excitement after ejaculation may be averted and the male organ retained for a while, which is an agreeable and tender finale for the man and often a main factor in sexual satisfaction for the woman, for it tends to equalise the sharp contrast between