What to do in such cases? Where the woman's libido is normal or near normal, then naturally it should be normally gratified. But if the libido seems to be abnormally strong and the demands for sexual gratification are too frequent, then the woman should be treated and sexual gratification should not be indulged in, because in such cases, as a rule, sexual gratification only adds fuel to the fire, and the woman's demands may become more and more frequent, more and more insistent. In exceptional cases it may even reach the intensity of nymphomania. In such cases the aid of a tactful physician is indispensable. Change of Life in Men To people not familiar with the subject it sounds rather strange to speak of "change of life" in men. Man, possessing no menstrual function, cannot have any menopause, but still sexologists and psychologists who have studied the subject carefully are convinced that between the ages of forty-five and fifty-five men also undergo a certain change which may be spoken of as the change of life or the male climacteric. They become irritable, capricious, very susceptible to feminine charms, are apt to fall in love, and in many the sexual instinct is greatly increased. As in women, this increase of the sexual desire is sometimes due to pathologic causes, such as an inflamed prostate gland--in other cases it is of psychic origin. Just as a man should be particularly kind and considerate to his wife during her menopause, so the wife, understanding that her husband is going through a critical period, will also increase her tact, patience and consideration. CHAPTER NINETEEN THE HABIT OF MASTURBATION Definition of Masturbation--Its Injurious Effects in Girls as Compared with Boys--Married Life of the Girl Masturbator-- Necessity for Change in Injurious Attitude of Parents who Discover the Habit--Common-sense Treatment of the Habit--How to Prevent Formation of Habit--Parents' Advice to Children--Hot Baths as Factor in Masturbation--Other Physical Factors--Mental Masturbation and Its Effects.