(R. Disselhorst, _Die
Accessorischen Geschlechtsdrusen der Wirbelthiere_, 1897, p.
212.)
In man there can be little doubt that detumescence is more
rapidly accomplished in the European than in the East, in India,
among the yellow races, or in Polynesia. This is probably in part
due to a deliberate attempt to prolong the act in the East, and
in part to a greater nervous erethism among Westerns.
In the woman the specifically sexual muscular process is less visible,
more obscure, more complex, and uncertain. Before detumescence actually
begins there are at intervals involuntary rhythmic contractions of the
walls of the vagina, seeming to have the object of at once stimulating and
harmonizing with those that are about to begin in the male organ. It would
appear that these rhythmic contractions are the exaggeration of a
phenomenon which is normal, just as slight contraction is normal and
constant in the bladder. Jastreboff has shown, in the rabbit, that the
vagina is in constant spontaneous rhythmic contraction from above
downward, not peristaltic, but in segments, the intensity of the
contractions increasing with age and especially with sexual development.
This vaginal contraction which in women only becomes well marked just
before detumescence, and is due mainly to the action of the sphincter
cunni (analogous to the bulbo-cavernosus in the male), is only a part of
the localized muscular process.
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