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experimented on herself in order to ascertain how far she
could control the action of her perivaginal muscles, and
reported the results to me. The experience of several other
women confirms hers. I quote verbatim from my work on
" Fertility and Sterility in Marriage/' p. 161, Chapter V.*
" (a) In order to test the working of the muscles which had
appeared to clasp the male organ in coitus, she introduced a
speculum which she had previously rinsed and soaked in
warm water. ' Through contractions of the muscles of the
orifice (Constrictor Cunni), as distinct from the deeper
muscles of the upper vagina, it was possible to move the
speculum: it was drawn or sucked into the vagina during
the contractions and slipped out as the muscles relaxed.
The movements of " snapping " were quite ineffective, as the
speculum was not deep enough inside.'
" (b) (Experiment to test the power of voluntary contrac-
tion in the deeper vaginal muscles.) ' A narrow tube or
uterine sound was introduced. The " snapping " contrac-
tions moved it vigorously to and fro from left to right;
it almost rotated. The sound must be inserted very far
and in this case a rubber one was used. The difference
between " snapping " and " sucking " is clear.' "
If women have once realised the nature of the movements
involved, they can exercise the various muscles indepen-
dently of instrumental or mechanical aid.
* See also pp. 157-162, and " Ideal Marriage," pp. 65-72.
