To Catholics, sex education means primarily the training of boys and girls to be pure and innocent, and eventually to enter marriage with a noble and holy purpose - if God calls them to that state of life. According to official Catholic teaching, sex education is the duty of the parents. Father Sattler has written this book to help parents fulfill this extremely important duty. Applying the traditional Catholic principles to very practical questions, he explains what parents should tell their children, when and how they should tell it, what psychological and moral dangers they must avoid, and what questions they should expect. Father Sattler assures Catholic parents that they may indeed consider themselves qualified for this task, if they have become thoroughly familiar with the contents of this book.