A great physiological fact which requires now to be faced is that promiscuous intercourse cannot be made physically healthy. The reasons for this have already been stated.[5] But no practical measures are sound which do not steadily repress this dangerous and debasing practice in men and women. This great problem of sexual evil has never hitherto been studied from the two sides which Nature presents to us. But sound physiology requires that the parallel functions and equal attraction in the two halves of humanity be considered. A Christian nation must recognise that the purchase of the weaker by the stronger is a cruel and debasing trade which must be checked, and that the substitution of promiscuous intercourse for Christian marriage is a physical and moral degradation to each half of the human race. When the facts are fully grasped--1st, that men are not made dependent upon women for the maintenance of individual health and vigour; 2nd, that women violate a law of nature when they fail to reverence their potential motherhood--the great principle which should guide sex legislation will be established. In all practical measures required to check sex disorders in our midst, the co-operation of experienced men and women is essential. Whether it be for the maintenance of good order in the streets, for purification of the slums, for reduction of brothels, for reform of marriage laws, or for the extirpation of venereal disease, no regulations will unite expediency with justice, which do not proceed from the united wisdom of earnest men and women. There are encouraging signs in the present day that such a source of hopeful practical reform will become possible, and that men and women of large experience are rising into that reverential recognition of the Creative Power entrusted to the human race, which will enable them to consult together, and thus gain the wisdom necessary for practical action. The awful aberrations of our sexual nature, which produce such profound social disorder and exercise such degrading influence on the relations of men and women, result from ignorance of physiological laws and the adaptation of human physical structure to the maintenance of those laws. It is through the recognition of these facts by the medical profession, and their instruction of parents in the truths of physiology, that the most powerful impetus to human growth may now be given. The medical profession can prove, through its knowledge of the physical and mental structure of the human race, that the great Christian doctrine of one equal standard of morality for our race is true doctrine based upon our human constitution.