Of all the problems which the alert and curious mind of modern man is considering, none occupies him more than that of the relations of the sexes. This is natural. It touches us all and we have made rather a mess of it! We want to know why, and we want to do better. We resent being the sport of circumstance and perhaps we are beginning to understand that this instinct of sex which has been so great a cause of suffering and shame and has been treated as a subject fit only for furtive whispers or silly jokes, is in fact one of the greatest powers in human nature, and that its misuse is indeed "the expense of spirit in a waste of shame.