The fifth kind of persons who ought not to teach the personal side of sex-hygiene are those who cannot command the most serious respect of their pupils. This applies especially to many men teachers whose flippant attitude and even questionable living are not likely to help their pupils, especially boys, towards a satisfactory interpretation of sex problems. Of course, such teachers ought not be in schools at all, but the fact is that for various reasons they sometimes get there and stay there; and so they must be weighed by the school official who selects the teachers to be intrusted with special problems of sex-education. [Sidenote: No instruction without satisfactory teachers.] Summarizing, I have in this lecture aimed to warn the school administrator, and others who must select teachers of classes, against the kinds of teachers who ought not be chosen for presenting the special problems of sex-education, especially those of sex-hygiene and sex-ethics. I have pointed out that there are five serious disqualifications; and it is probable that if strictly applied when choosing teachers for special sex-instruction, there will be elimination of three or four in every ten of those whose training in science might be expected to qualify them as teachers of this special line. It is a fair question as to what a school or other institution should do if it has no teachers who are free from the above disqualifications. My own belief is that it is better to get an outsider for the handling of the special problems. If this is impracticable, then suggest to the students that they read certain books such as are recommended in the last sections of this book. Even entire omission of the study of the personal and social aspects of sex-hygiene and sex-ethics is far wiser than intrusting a class to a teacher with one or more of the negative qualifications that we have been considering in this lecture. The effect of sex-education upon individual lives will in no small degree depend upon the impression made by the living teacher who deals with the difficult problems of sex in relation to hygiene and ethics. Hence, the greatest care should be taken when selecting the teacher for this all-important part of the student's sex-education. V BOOKS AS TEACHERS CONCERNING SEX AND LIFE Sec. 22. _Value and Danger of Special Sex Books for Young People_ [Sidenote: Books for private reading.]