Kisch is very decidedly of the same opinion, and considers that the popular belief on this point is fully justified. It is a fact, he states, that an unfaithful wife is more likely to conceive with her lover than with her husband, and he concludes that, whatever the precise mechanism may be, "sexual excitement on the woman's part is a necessary link in the chain of conditions producing impregnation." (E.H. Kisch, _Die Sterilität des Weibes_, 1886, p. 99.) Kisch believes (p. 103) that in the majority of women sexual pleasure only appears gradually, after the first cohabitation, and then develops progressively, and that the first conception usually coincides with its complete awakening. In 556 cases of his own the most frequent epoch of first impregnation was found to be between ten and fifteen months after marriage. The removal of sexual frigidity thus becomes a matter of some importance. This removal may in some cases be effected by treatment through the husband, but that course is not always practicable. Dr. Douglas Bryan, of Leicester, informs me that in several cases he has succeeded in removing sexual coldness and physical aversion in the wife by hypnotic suggestion. The suggestions given to the patient are "that all her womanly natural feelings would be quickly and satisfactorily developed during coitus; that she would experience no feeling of disgust and nausea, would have no fear of the orgasm not developing; that there would be no involuntary resistance on her part." The fact that such suggestions can be permanently effective tends to show how superficial the sexual "anesthesia" of women usually is. Not only, therefore, is the apparatus of sexual excitement in women more complex than in men, but--in part, possibly as a result of this greater complexity--it much more frequently requires to be actively aroused. In men tumescence tends to occur almost spontaneously, or under the simple influence of accumulated semen. In women, also, especially in those who live a natural and healthy life, sexual excitement also tends to occur spontaneously, but by no means so frequently as in men. The comparative rarity of sexual dreams in women who have not had sexual relationships alone serves to indicate this sexual difference. In a very large number of women the sexual impulse remains latent until aroused by a lover's caresses. The youth spontaneously becomes a man; but the maiden--as it has been said--"must be kissed into a woman."