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CONTRACEPTION

(2) Placing the body in positions likely in her individual case to prevent contact of the penis with the cervix.

Little need be said about this method as it is merely a sub-variety of (1) (p. 56). The action is based on the experience of certain women that they become pregnant only when the glans penis actually interlocks with the external os. That this ever takes place is, I am aware, contradicted. by some medical practitioners. Nevertheless it is a positive fact that it does take place. There is little doubt that pregnancy is much more certain when the glans penis does thus interlock with the os. Probably, therefore, there is a slight measure of security for the woman who prevents this taking place if her vagina also be of the "acid variety.[1]

Illustrative Case.

Case S. 1.—A lady, five years married, desirous of children, did not become pregnant till the first time she achieved orgasm

  1. ↑ I should at the outset perhaps make it clear that I think that most of these contraceptive questions, and indeed the sex relationships in general, are very much influenced by a physiological feature most generally overlooked, namely, the degree of permanent or temporary acidity or alkalinity of the vaginal fluids. The reactions of the vaginal secretions in different women, and in the same woman at different times, vary enor-

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