Brother Roger, a Franciscan  of singular purity, being once asked why he was so reserved in his  intercourse with women, replied, that when men avoid the occasions of  sin, God preserves them; but when they expose themselves to danger, they  are justly abandoned by the Lord, and easily fall into some grievous transgressions.”  -  St. Alphonsus Liguori, The True Spouse of Jesus Christ, Mortification of the Eyes, p. 221