It has also been shown that the secretion of semen does not necessitate a resort to sexual congress, but that there is a distinct and healthy provision for the removal of unneeded secretions in each sex which leaves the individual the power of self-guidance. Physiology condemns fornication by showing the physical arrangements which support the moral law. There is no justification in the physiological structure of humanity for the destructive practice of fornication. We thus see by the light of sound physiology, and the advanced thought of the nineteenth century, the profound insight of the founders of Christianity, who denounced in one equal and awful condemnation the whoremonger and the whore. CHAPTER V _The Development of the Idea of Chastity_ The most fundamental work which rests upon the medical profession is the spread of physiological truth in its practical application to the education of both boys and girls. The sexual instinct, being a primitive elementary instinct, exists alike in men and women. It is the necessary impulse leading to parentage, an impulse which the great Creative Force has laid down as a law of our present human life. But chastity and continence are not primitive instincts in either sex; they are the higher growth of reason, and of the religious and legal guidance by which in every age it has been found indispensable to direct the impulse of sex. The way in which this instinct may be exercised to the permanent advantage of a progressive community is a gradual discovery of the human race. It is a development or differentiation of the primitive instinct; but the instinct and the wise method of educating or of exercising it are separate facts. In the savage stage, in semi-barbarous countries, and in the slums of all great towns, both men and women are grossly unchaste. It is by the growth and expansion of human nature under a knowledge of providential law, that the necessity of guiding the exercise of the original instinct is perceived. Thus, varying institutions gradually arise out of the varied methods employed to guide the sexual impulse. Different circumstances, different systems of education, law, and religion, produce varying results. But all these results spring from a perception that the sexual instinct requires guidance, and cannot, without danger to society, be left in its primitive ignorance.