But the cause of the unchastity of boys is not that they become sensually mature earlier than they could judiciously enter into matrimony, the trouble lies in the fact that boys cannot see why they should abstain from a tickling amusement, which in their opinion does nobody any harm. Herein lies the greatest obstacle to continence. The youth does not know the ethical why, especially in our modern times with its religious laxity. The ethics of religion, even in its best days, had not had the power to control sensual passion and to create total abstinence, although religion, especially Christianity, has preached the same for the last two thousand years. In modern times with the almost divine worship of the personality of the individual the religious motive for chastity seems to fail entirely. Hence the ethics of evolution and the ethics of sex-hygiene must be tried. If the theory of evolution is right, and the purpose of our being in this world is to assert life, then the aim of life can not be the single individual but the species, which can only be preserved by the right offspring. The child or what is the same the family[EP] will have to furnish the motive for man’s continence. The importance of the chastity of women to the family has been recognized from the earliest history. It is now time to teach the man the importance of his chastity to the family, state and nation. He has to know his responsibility just as the woman knows hers. Rational chastity must be founded upon the sentiment of human responsibility. The average man in his heart does not acknowledge to himself that there is any competent reason why he should control his passion beyond the sentimental idea of the justice of men’s remaining chaste if they require it of women. It must, therefore, be shown to the man that there is also an important racial reason for him to abandon promiscuous life.[EQ] If it is shown to the young man, at a time when his heart and mind are still in the thrall of the early and eternal poetry of the race, that it is as important to humanity that he should be chaste as it is for the woman to be pure, then he will refrain from illicit indulgence. The following case is very instructive in this respect. A student of philosophy at one of the greatest German universities who led a promiscuous life like any other student, gave up such life immediately after reading Tolstoy’s Kreutzer-Sonate. For the first time, as he expressed it, he saw the reason why he should be as chaste as he expects his bride to be.