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

Relation of Phallus to Vagina and Clitoris during coitus in the obverse position, with increased pelvic inclination. Section through the female pelvis (drawing by the Author). The shadowed line a shows the outline of the male organ, and b indicates the orifice of the male urethra. The lines c and d convey an idea of the altered position of vagina and perinaeum when the phallus enters from in front whilst the pelvic inclination of the woman is increased. For the sake of clearness, there is no indication of the pressure and temporary change of position of other organs. The broken lines show the normal outlines of the female organs in repose. Note here especially the contact and friction of the glans clitoridis and phallus. Cf. for further particulars, the text of Chapter VIII., p. 67.
Publication/creation
London : W. Heinemann, Medical Books, 1933, ©1932.
Physical description
xvii, 163 pages 54 unnumbered pages of plates : illustrations
Contributors
Velde, Theodoor H. van de 1873-1937.
Notes
"With 480 cinematographic and 54 full-page illustrations"
Includes cinematographic supplement of 12 flip films illustrating exercises
Subjects
Women's Health
Physical Fitness
Exercise
Attribution and usage
Wellcome Collection
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