The manner m which neuro-psyehic disturbances act upon the bladder is well exemplified in the couplet of Hudibras—" before debating on the matter, he stepped aside to draw his water;" in the vulgar adage of a man having "the piss frightened out of him," as well as the tendency of great grief or other mental perturbation to cause the flow of urine; and I do not think it would be hard to trace all the phenomena which have been so laboriously compiled, in connection with this subject, to a similar cause. Many women, as do mares, urinate under the influence of strong sexual excitement, but on the other hand sexual excitement absolutely inhibits the discharge of urine in men. It is recorded that a young girl, seeing at the theatre a particularly fascinating man, was so overcome with sexual desire that she had to urinate;1 and it is well known that a full bladder favors sexual emissions during sleep; but both phenomena are readily explainable by the assistance which vesical repletion lends to vascular engorgement and resultant sexual tumescence; so that I am not in any manner convinced that there exists any specific sexual relation between the parts, more than can be readily accounted for on a purely physiological basis.
The circumstances recorded by Kubary, that the natives of the Caroline Islands tickle the privates of their women with the tongue, until the involuntary emission of urine shows that they are ready for sexual intercourse,' and that spoken of by Se'rieux, in which a girl of twelve was only enabled by urinating to overcome her impulse to masturbate,1 prove nothing but what may be accounted for by my last statement, and by the fact that one process distracts attention from the other; but that there is a very close connection between both bladder and sexual apparatus and the brain-centers, is quite susceptible of demonstration.
All motor influences are communicated to related muscles. On this ground the convulsion of laughter, for instance, is in direct relation, quite often, with the sexual-center, there being persons in whom loud laughter is the liberation of an explosive energy which, otherwise, might manifest itself in sexual activity. Frequently we hear of persons laughing till they " wet themselves," and the distribution of nervous discharges is explained by the connection between the motor-centers; the sexual motor explosion being the most powerful of our nature from the fact that it is the resultant of nearly all our physiological and psychic forces combined.