It is not necessary that the school teacher of sex should be a physician. For personal and particular advice on the concrete difficulties of sex, however, as well as for the more special and detailed hygiene of the sexual relationship and the precautions demanded by eugenics, we must call in the physician. Yet none of these things so far enter the curriculum through which the physician passes to reach his profession; he is often only a layman in relation to them. Even if we are assured that these subjects form part of his scientific equipment, that fact by no means guarantees his tact, sympathy, and insight in addressing the young, whether by general lectures or individual interviews, both these being forms of imparting sexual hygiene for which we may properly call upon the physician, especially towards the end of the school or college course, and at the outset of any career in the world.[188] Undoubtedly we have amongst us many mothers, teachers, and physicians who are admirably equipped to fulfil their respective parts--elementary, secondary, and advanced--in the work of sexual hygiene. But so long as they are few and far apart their influence is negatived, if it is not even rendered harmful. It must often be useless for a mother to instil into her little boy respect for his own body, reverence for the channel of motherhood through which he entered the world, any sense of the purity of natural functions or the beauty of natural organs, if outside his home the little boy finds that all other little boys and girls regard these things as only an occasion for sniggering. It is idle for the teacher to describe plainly the scientific facts of sex as a marvellous culmination in the natural unfolding of the world if, outside the schoolroom, the pupil finds that, in the newspapers and in the general conversation of adults, this sacred temple is treated as a common sewer, too filthy to be spoken of, and that the books which contain even the most necessary descriptions of it are liable to be condemned as "obscene" in the law courts.[189] It is vain for the physician to explain to young men and women the subtle and terrible nature of venereal poisons, to declare the right and the duty of both partners in marriage to know, authoritatively and beforehand, the state of each other's health, or to warn them that a proper sense of responsibility towards the race must prevent some ill-born persons from marrying, or at all events from procreating, if the young man and woman find, on leaving the physician, that their acquaintances are prepared to accept all these risks, light-heartedly, in the dark, in a heedless dream from which they somehow hope there will be no awful awakening.