[Y]ou are not ashamed of your sin [in committing adultery]....

“ [Y]ou are not ashamed of your sin [in committing adultery] because so many men commit it. Man's wickedness is now such that men are more ashamed of chastity than of lechery. Murderers, thieves, perjurers, false witnesses, plunderers and fraudsters are detested and hated by people generally, but whoever will sleep with his servant girl in brazen lechery is liked and admired for it, and people make light of the damage to his soul. And if any man has the nerve to say that he is chaste and faithful to his wife and this gets known, he is ashamed to mix with other men, whose behaviour is not like his, for they will mock him and despise him and say he's not a real man; for man's wickedness is now of such proportions that no one is considered a man unless he is overcome by lechery, while one who overcomes lechery and stays chaste is considered unmanly. ”

Augustine of Hippo

From : Sermons 1-19