=The wise father looks after less important phases of his son’s education.=--If his son decides to be a farmer, he tells him all he knows about farming and sends him to an agricultural college. If he decides to practice medicine, he tells him all he knows about medicine and sends him to a medical college. His interest in his son would lead him to follow this plan should he choose some other calling or profession. Compared to the education, training and development of a boy in relation to the teaching of purity and sex truths, all other training pales into insignificance. The boy can just as easily become a successful farmer without a knowledge of agriculture, horticulture and stock-raising; he can as easily become a successful physician without a knowledge of medicine; he can as easily become a successful lawyer without a knowledge of laws, as he can develop into a pure, virile manhood without a correct knowledge of his sex nature. Since half truths are often more injurious than ignorance, and since the enfolding sex life of a boy demands information, and since he will get this information true or false, it logically follows that correct sex education is the only safe method to be followed in the complete education of the boy. =The father who holds to unethical ideals.=--The father who holds to or practices the double standard of morals is not qualified to teach these truths to his son. If he believes that it is a smaller sin for his son to be immoral than for his daughter; if he believes in the “sex necessity lie” for his son and absolute virginity for his daughter; if he uses vulgar words or indulges in lascivious stories, he is disqualified for this sacred duty of a father. Recently I lectured in a town of several thousand inhabitants where the mayor boasted of taking his seventeen-year-old son to St. Louis and introducing him to an immoral life. Such a father’s influence on his own son is a withering, paralyzing, blighting curse. The sons of such beastly sires are to be pitied. =The model father.=--I assume that I am now addressing a model father, one who, at least, desires to be a worthy example and a wise teacher and trainer of his son. The model father should not only be pure in outward life, but he should regard the organs of sex and their functions as pure and sacred, he should possess a fair knowledge of sex and be able to use only pure language in his confidential talks with his son. I am fully aware that very few fathers have had an opportunity to hear a series of lectures or to read a good book on these lines that would help them perform this duty. The mission of this book is to aid and inspire every sincere father in his duty of supplying his son with these truths.