Book excerpt: Isn't sexual -- or emotional -- intimacy enough? "No," says Christian psychologist Dr. David Clarke. "Spiritual bonding is the process by which a couple cultivates the presence of God in their relationship," he says, "and it's the only 'glue' that sustains relationships long-term." Working with hundreds of couples, Clarke observes that when we take specific steps to keep God at the center of our relationships, every area of intimacy is energized. This book teaches men and women in a committed relationship how to pray together, create "spiritual conversations," read and study Scripture together, hold private worship sessions, and allow the Holy Spirit to guide them. It's extremely practical counsel all couples need today.