ith the "needs of activity," but under this head he
coordinates it with the "need of urination." That is to say, that both
alike are nervous explosions. Micturition, like detumescence, is a
convulsive act, and, like detumescence also, it is certainly connected
with cerebral processes; thus in epilepsy the passage of urine which may
occur (as in a girl described by Gowers with minor attacks during which it
was emitted consciously, but involuntarily) is really a part of the
process.[48]

There appears, indeed, to be a special and intimate connection between the
explosion of sexual detumescence and the explosive energy of the bladder;
so that they may reinforce each other and to a limited extent act
vicariously in relieving each other's tension. It is noteworthy that
nocturnal and diurnal incontinence of urine, as well as "stammering" of
the bladder, are all specially liable to begin or to cease at puberty. In
men and even infants, distention of the bladder favors tumescence by
producing venous congestion, though at the same time it acts as a physical
hindrance to sexual detumescence[49]; in women--probably not from pressure
alone, but from reflex nervous action--a full bladder increases both
sexual excitement and pleasure, and I have been informed by several women
that they have independently discovered this fact for themselves and
acted in accordance with it. Conversely, sexual excitement increases the
explosive force of the bladder, the desire to urinate is aroused, and in
women the sexual orgasm, when very acute and occurring with a full
bladder, is occasionally accompanied, alike in savage and civilized life,
by an involuntary and sometimes full and forcible expulsion of urine.[50]
The desire to urinate may possibly be, as has been said, the normal
accompaniment of sexual excitement in women (just as it is said to be in
mares; so that the Arabs judge that the mare is ready for the stallion
when she urinates immediately on hearing him neigh). The association may
even form the basis of sexual obsessions.[51] I have elsewhere shown that,
of all the influences which increase the expulsive force of the bladder,
sexual excitement is the most powerful.[52] It may also have a reverse
influence and inhibit contraction of the bladder, sometimes in association
with shyness, but also independently of shyness. There is also reason to
suppose that the nervous energy expended in an explosion of the tension
of the sexual organs may so