The research proves it.
Fan the flame of what God intended a husband and wife to offer one another, and perhaps marriages will become all that we criticize they aren't.
That includes whether you're married or can speak into the lives of others who are... they don't need yet another person riffing on them for "the old ball and chain" - they need a friend who will encourage them to honor their vow "in sickness and in health, for better or for worse, to love and to cherish, as long as they both shall live."
"Honor marriage, and guard the sacredness of sexual intimacy between wife and husband." (Hebrews 13:4a, The Message)