It was found that there was a great general elevation of
blood-pressure, intense hyperaemia of the brain, rapid alternations, during
the act, of vasoconstriction and vasodilatation of the brain, with
increase and diminution of the general arterial tension in relation with
the various phases of the act, the greatest cerebral vasodilatation and
hyperaemia coinciding with the moment following the intromission of the
penis; the end of the act is followed by a considerable fall in the
blood-pressure.[111] I am not acquainted with any precise observations on
the blood-pressure in human subjects during detumescence, and there are
obvious difficulties in the way of such observations. It is probable,
however, that the conditions found would be substantially the same. This
is indicated, so far as the very marked increase of blood-pressure is
concerned, by some observations made by Vaschide and Vurpas with the
sphygmanometer on a lady under the influence of sexual excitement. In this
case there was a relationship of sympathy and friendly tenderness between
the experimenter and the subject, Madame X, aged 25. Experimenter and
subject talked sympathetically, and finally, we are told, while the latter
still had her hands in the sphygmanometer, the former almost made a
declaration of love.
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