According to the observations of _Schüle_, young married, hysterical women not infrequently run away with a waiter during the honeymoon journey. This author also points out that in women moral insanity is especially apt to manifest itself during the first years of married life. Many advocate a far-reaching libertinism, and threaten to enter a brothel. In these forms we observe, in addition to ill-temper and malignity, especially obscenity and tribadism. Such a case, observed by _Giraud_ and quoted by _von Krafft-Ebing_, is the following: Marianne L., of Bordeaux, during the night, while her master was sleeping soundly under the influence of narcotics she had administered, was in the habit of giving up her master’s children to her lover for his sexual gratification, and made them witnesses of the most immoral scenes. It appeared that L. was hysterical, suffering from hemianæsthesia and convulsive seizures, and that before her illness she had been a sensible and trustworthy individual. After the illness, however, she prostituted herself in the most shameless manner and completely lost her moral sense. _Galen_ relates of his own mother that she suffered from nymphomania, and that in the attacks she bit her female slaves like a wild animal. As a negative aspect of the sexual impulse in woman we must regard the absence of the impulse, or anæsthesia sexualis, and also the deficiency of the sensation of pleasure during the act of copulation, or dyspareunia. Of dyspareunia we shall speak more at length later, in connection with the pathology of copulation. As regards the entire lack of the sexual impulse, however, in women whose genital organs are normally developed and normal in the performance of their functions, and whose cerebral condition is also normal, we must consider such lack an extremely rare condition, if indeed it ever occurs. It is only in cases in which the female genital organs are wanting, wholly or to a considerable extent, or in which there are important cerebral disturbances or states of mental degeneration, that the sexual impulse is wanting. Normally, in the young, sexually unspoiled girl, the sexual instinct[34] slumbers in the cerebral cortex, but becomes active, as sensation, perception, and impulse, as soon as the cerebral centre has been aroused by mental impressions or by physical peripheral stimulation of the genital organs and their environment. Among stimuli of the latter class must be reckoned the menstrual stimulus, set on foot by the developmental processes of puberty. These stimuli arouse in the cerebral cortex sensations and perceptions which, rising to specific sexual feelings, produce an impulse to increase the intensity of these feelings by purposive action; thus is awakened the sexual impulse, the strength of which is extremely variable.