Is it acceptable for Christian husbands to spank their wives?

Absolutely not. You are her husband, not her father (and it would be unacceptable for a father to spank his daughter as well).

It is perfectly acceptable provided the spanking is not too extreme and completely consensual. Many wives declare that they want their husband to turn her over his knee, pull her panties down and tan her bottom for specific misbehaviors or bad attitude. Using a hand or a hairbrush, either is suitable for the purpose and I admire couples that incorporate the corporal in their healthy, loving unions. Bravo! - Happy Hubby