In reading several dozen books on sex matters for the young with a view to selecting the best for my own children, I found ne that I was willing to put into their hands, without first guarding them against what I considered very misleading and harmful impressions, which they would otherwise be sure to acquire in reading them. That is the excuse for this article. It is far more specific than most sex information written for young people. I believe we owe it to children to be specific if we talk about the subject at all.