You know that the Tasmanians, who never committed adultery, are now extinct. – W. Somerset Maugham

You may build castles in the air, and fume, and fret, and grow thin and lean, and pale and ugly, if you please. But I tell you, no man worth having is true to his wife, or can be true to his wife, or ever was, or will be so. – Sir John Vanbrugh

The hood-winked husband shows his anger, and the word jealous is flung in his face. Jealous husband equals betrayed husband. And there are women who look upon jealousy as synonymous with impotence, so that the betrayed husband can only shut his eyes, powerless in the face of such accusations. – J. August Strindberg