How about the story of when Jesus was dining with the Pharasee. A woman who was knowb as a sinner came in and annointed his feet with perfume and dried them with her tears. Jesus said that because of her love her sins, though many were forgiven.
Here we have a group of couples, who for various reasons were living in sin. They respond positivly to the overtures of the Church and renounce the sin that they were living under by going through the necessary preparations and get married.
Jesus said that there is greater joy in heaven in the repentance of one sinner than in the ninety nine others who have no need of repentance.