[15] Sets of drawings and lantern slides for the biological introduction to sex may be obtained from the American Social Hygiene Association, 105 W. 40th St., New York City. [16] The instructor of young men should not allow confusion to arise from the recent contention of some medical men that emissions are abnormal or unnatural because they are not known to occur in animals. Certain it is that they are adaptations to changes caused by enforced sexual restraint after the seminal secretions begin with puberty. Such restraint is, of course, abnormal or unnatural if we compare with animals; but many of our acts are unnatural and not necessarily unhealthful. For instance, the sedentary life of the student or professional worker is abnormal or unnatural, but it need not be unhealthful, if hygienic adaptations are made. Likewise, seminal emissions are unnatural for primitive men or animals without sexual restraint, but this does not mean that they are unhealthful for self-controlled men. Here, as in many other cases, comparison with animals is misleading and does not teach us useful facts concerning human sexual functioning. The truth is that physicians have no evidence of harm from emissions that are not caused by voluntary activity. VIII SPECIAL SEX-INSTRUCTION FOR ADOLESCENT BOYS AND YOUNG MEN [Sidenote: Methods and teachers.] In this lecture I shall discuss a number of problems in the relations of men to women which ought somehow to be made clear to boys who are in transition to manhood. I can do little more than point out the lines along which it is desirable that young men should be informed and influenced; for I confess that I do not know any guaranteed pedagogical method for teaching along these lines. So far as I can now see, it seems to me that a good beginning would consist in getting the best ideas before young men by lectures, books, and personal conversations. Here more than in any other phase of sex-education the influence of personality is of great importance. Many an ordinary teacher or lecturer may well present the cold facts of biological science that help interpret sex, but one who does not by his personal qualities command the entire confidence of his hearers is worse than useless in presenting to young men such problems as those outlined in this lecture under the following subheadings: Developing young men's attitude towards womanhood; developing ideals of love and marriage; reasons for pre-marital continence; essential knowledge concerning prostitution; need of more refinement in men; dancing as a sex problem for men; dress as a sexual appeal; the problem of self-control; the mental side of a young man's sex life. Sec. 30. _Developing Attitude towards Womanhood_ [Sidenote: Influence of ideals.]