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 Greece immorality had always been quite blatant. Long ago Demosthenes had written: "We keep prostitutes for pleasure; we keep mistresses for the day-to-day needs of the body; we keep wives for the begetting of children and for the faithful guardianship of our homes." So long as a man supported his wife and family there was no shame whatsoever in extra-marital relationships. 