It is possible for a man to take joy in the wife of his youth and to be always and only ravished by her beauty alone — if he exhibits the discipline to do so. What’s more, since it’s God’s Word that defines what normal behavior is for Christians, we’re also forced to conclude that the discipline of guarding the eyes and the heart is not only possible but that God considers such a discipline to be normal among His sons.
Since so many men have not disciplined themselves, most have weak logic when it comes to their sexuality. The irrational often seems rational.
Let your fountain [of human life] be blessed [with the rewards of fidelity], and rejoice in the wife of your youth. Let her be as the loving hind and pleasant doe [tender, gentle, attractive] — let her bosom satisfy you at all times, and always be transported with delight in her love. Why should you, my son, be infatuated with a loose woman, embrace the bosom (physically or visually) of an outsider, and go astray? (PROVERBS 5:18-20, AMP)