Biological foundations.
I believe that the best introduction to advanced sex-instruction is through biological ideas which may be presented in popular lectures and books; but, of course, will be best taught in courses of biological science. My own view as to the selection of materials for such biological studies is expressed in the sections on reproduction connected with the account of each animal or plant type in the "Applied Biology" and in the last chapter of the "Introduction to Biology."[14] In these books the study of life-histories of plants and animals leads up through vertebrates to mammals, and there are a few remarks suggesting that human development is like the mammals.[15] At this point these books should be supplemented by a brief survey of the essential structure, physiology, and embryology of human reproduction.
Mixed classes.
Biological studies of human reproduction should not be coeducational in high schools or the early years of college. Mature college students who have passed through extensive biological studies, may, without apparent embarrassment, study human embryology in mixed classes; but after experience with many such groups I have begun to think that separate classes are desirable if the course is made to include all the important facts that college graduates should know concerning human reproduction. At any rate, there should be special lessons or reading dealing with detailed information that directly concerns one sex only.
Impersonal approach of biology.
I certainly do not believe in completely revamping biological science for the purposes of sex-education. It is better not to "spoil" a course by overemphasis on sex, for much of the value of biology as a basis for sex-education is the fact that sex appears gradually and naturally and far away from human relations. This impersonal approach will be lost if the course in biology seems to revolve around sex-education, for that will make sex too prominent.
It is still debatable as to how much should be taught in high schools or in public lectures concerning the biological facts of human reproduction. I think that I can make my own views clearer if I discuss this first for boys, then for girls.
§ 28. Scientific Facts for Boys
First, it is generally agreed that boys of high-school age may profit by learning their own sexual structure by means of diagrams such as the one in Hall's "Sexual Hygiene." There is no harm, and also no gain, in minute description, especially histological.
Scientific names.