Another bad effect of superstition on education is the absence of instruction about the facts of sex. The main physiological facts ought to be taught, quite simply and naturally, before puberty, at a time when they are not exciting. At puberty, the elements of an unsuperstitious sexual morality ought to be taught. Boys and girls should be taught that nothing can justify sexual intercourse unless there is mutual inclination. This is contrary to the teaching of the Church, which holds that, provided the parties are married and the man desires another child, sexual intercourse is justified however great may be the reluctance of the wife. Boys and girls should be taught respect for each other’s liberty; they should be made to feel that nothing gives one human being rights over another, and that jealousy and possessiveness kill love. They should be taught that to bring another human being into the world is a very serious matter, only to be undertaken when the child will have a reasonable prospect of health, good surroundings, and parental care. But they should also be taught methods of birth-control, so as to insure that children shall only come when they are wanted. Finally, they should be taught the dangers of venereal disease, and the methods of prevention and cure. The increase of human happiness to be expected from sex-education on these lines is immeasurable. It should be recognized that, in the absence of children, sexual relations are a purely private matter, which does not concern either the State or the neighbours. Certain forms of sex which do not lead to children are at present punished by the criminal law: this is purely superstitious, since the matter is one which affects no one except the parties directly concerned. Where there are children, it is a mistake to suppose that it is necessarily to their interest to make divorce very difficult. Habitual drunkenness, cruelty, insanity are grounds upon which divorce is necessary for the children’s sake quite as much as for the sake of the wife or husband. The peculiar importance attached, at present, to adultery is quite irrational. It is obvious that many forms of misconduct are more fatal to married happiness than an occasional infidelity. Masculine insistence on a child a year, which is not conventionally misconduct or cruelty, is the most fatal of all.