But concerning brotherly love, you have no need that one write to you. For you yourselves are taught by God to love one another,

 In a book entitled What I Believe, a symposium of the basic beliefs of a selection of well-known men and women, Kingsley Martin writes: "Once women are emancipated and begin to earn their own living and are able to decide for themselves whether or not they have children, marriage customs are inevitably revised. 'Contraception,' a well-known economist once said to me, 'is the most important event since the discovery of fire.' Basically he was right, for it fundamentally alters the relations of the sexes, on which family life is built. The result in our day is a new sexual code; the old 'morality' which winked at male promiscuity but punished female infidelity with a life-time of disgrace, or even, in some puritanical cultures, with a cruel death, has disappeared. The new code tends to make it the accepted thing that men and women can live together as they will, but to demand marriage of them if they decide to have children." 