ission of the semen in the one sex, its reception in the
other. In both sexes the sexual orgasm and the pleasure and satisfaction
associated with it, involve, as their most essential element, the motor
activity of the sexual sphere.[121]

The active co-operation of the female organs in detumescence is
probably indicated by the difficulty which is experienced in
achieving conception by the artificial injection of semen. Marion
Sims stated in 1866, in _Clinical Notes on Uterine Surgery_, that
in 55 injections in six women he had only once been successful;
he believed that that was the only case at that time on record.
Jacobi had, however, practiced artificial fecundation in animals
(in 1700) and John Hunter in man. See Gould and Pyle, _Anomalies
and Curiosities of Medicine_, p. 43; also Janke (_Die
Willkuerliche Hervorbringen des Geschlechts_, pp. 230 et seq.) who
discusses the question of artificial fecundation and brings
together a mass of data.

The facial expression when tumescence is completed is marked by a high
degree of energy in men and of loveliness in women. At this moment, when
the culminating act of life is about to be accomplished, the individual
thus reaches his supreme state of radiant beauty. The color is heightened,
the eyes are larger and brighter, the facial muscles are more tense, so
that in mature individuals any wrinkles disappear and youthfulness
returns.

At the beginning of detumescence the features are frequently more
discomposed. There is a general expression of eager receptivity to sensory
impressions. The dilatation of the pupils, the expansion of the nostrils,
the tendency to salivation and to movements of the tongue, all go to make
up a picture which indicates an approaching gratification of sensory
desires; it is significant that in some animals there is at this moment
erection of the ears.[122] There is sometimes a tendency to utter broken
and meaningless words, and it is noted that sometimes women have called
out on their mothers.[123] The dilatation of the pupils produces
photophobia, and in the course of detumescence the eyes are frequently
closed from this cause. At the beginning of sexual excitement, Vaschide
and Vurpas have observed, tonicity of the eye-muscles seems to increase;
the elevators of the upper lids contract, so that the eyes look larger and
their mobility and brightness are heightened; with the increase of
muscular toni