If the views put forward in the previous chapters be correct, if morality is the interest of the stronger, and if, where the stronger is the herd of average individuals, it expresses itself in disapproval of conduct from which the average, for whatever reason, shrink, then the driving force of morality is to be looked for not in any innate sanction but in the power which the herd possess of rendering intolerable the lives of those who flout its prejudices. But in order that the herd may be able to exercise this power, it must be in a position to detect the objects of its censure. This has been possible in the past owing to the unfortunate propensity of sexual irregularity to result in offspring. It is not easy to disguise the existence of a child, and, even if the desperate course of overlaying or otherwise extinguishing it be adopted, the disposal of the corpse presents grave difficulties. Such a course is also open to the objection of doing grave violence to the humaner parental instincts. But birth-control precludes the necessity for children, and by so doing makes it possible to “sin” without being found out. It is not to be expected that people will refuse to avail themselves of the liberty thereby conferred. Whether we are to infer that people are by nature sinful, or simply that a sin which has been manufactured by herd morality is not really a sin, is a question that does not immediately concern us. What does concern us is the impetus which this ability to avoid detection is likely to give to irregular intercourse. Birth-control combined with economic independence has brought a new freedom to women. Economic independence enables them to have children without going either to the altar or into the workhouse. The practice of birth-control makes it unnecessary even to have the children.