These crude examples of the result of driving sex into a dark corner exactly represent what one is up against in school, and in the world, when one begins to deal with sex openly and cleanly as a natural and non-repressible instinct. Really these people are a type of prude, much as they would resent this classification, for they persist in regarding sex as something which is rather naughty. They even imagine that to take away from it the cloak of unnaturalness with which they have surrounded it is to rob it of all its attraction. This is ridiculously untrue. Sex is attractive because it is romantic, and, so long as one does not go to the opposite extreme of regarding it merely through the musty glasses of scientific classification, it becomes no less attractive when it is open and natural, and ceases to be the cause of giggling asides. Before any moral sense in the sex-problem can be established there must be a fundamental cleaning of this cess-pool, this strange medley of official silence, unnatural repression, and unclean secretiveness. The main road to a moral sense is sex-education. And it is necessary, therefore, to conclude this outline of principles by suggesting some conditions which should govern such instruction. It is obvious that sex-education must be advanced on the process of a sliding scale. Before puberty sex should not appear on the horizon of the child's consciousness. The precocious child must of course be specially dealt with, but usually the first lessons in sex should commence with the period of mental puberty. Before that time the small child jokes only about the normal excretory functions, and this can be adjusted by emphasizing the unmanly and unnecessary character of such forms of humour. A child has usually an exaggerated impression of the value of the adult standard, an impression which it must be confessed is too often subject to subsequent disillusionment. While it remains, however, it can be used, and it can be pointed out that "grown-ups" do not consider the excretory system has any more claim to ridicule than the process of digestion or sleep. Vulgarity and coarseness are not symptoms even of immoral sexuality.