"The characteristic massiveness of the experience is probably due
largely to the great number of sensations of strain and pressure
caused by the powerful reflex contraction of so many of the
voluntary muscles.
"Of course, the foregoing analysis is purely tentative, and I
offer it only on the chance that it may suggest some line of
inquiry which may lead to results of value to the student of
sexual psychology."
In man the whole process of detumescence, when it has once really
begun, only occupies a few moments. It is so likewise in many
animals; in the genera Bos, Ovis, etc., it is very short, almost
instantaneous, and rather short also in the Equidae (in a vigorous
stallion, according to Colin, ten to twelve seconds). As
Disselhorst has pointed out, this is dependent on the fact that
these animals, like man, possess a vas deferens which broadens
into an ampulla serving as a receptacle which holds the semen
ready for instant emission when required. On the other hand, in
the dog, cat, boar, and the Canidae, Felidae, and Suidae generally,
there is no receptacle of this kind, and coitus is slow, since a
longer time is required for the peristaltic action of the vas to
bring the semen to the urogenital sinus.
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