Puritan Sailor
Puritan Board Doctor
Scripture has high standards for the duties of wife and mother. A child is completely incapable of beginning to meet such standards. She is in no way able to be a helpmeet to her husband, and a husband can certainly never bear his own soul to a child-wife and get any consolation. It's simply a practical impossibility. There's more to marital union than just male sexual gratification. And I can't imagine how such a marriage to children would not begin with an act of rape. If you want further Scriptural basis, simply go back to Gen 2. Eve was designed as a helpmeet, that is a woman who perfectly complements her husband, both in function and dignity. Proverbs 31, though poetic, certainly requires more than a child could ever give. Now, I think it is entirely possible for a girl 13-15 years to be capable of such maturity (though biologically it's pushing it for some girls), but it is a rare thing in our culture. Certainly anyone younger, should wait. They must be mature enough to perform their spiritual and social duties, not just biological.