Huston we have a problem, mistranslation in the verse. I see its a very serious mistranslation since the posters directly below this one also quote the same thing.
It is not "Beat them" , the correct translation is "Move away from them"
The arabic word Athrib means "to beat" in modern Arabic. However in the classical Arabic it meant "to separate" or "to move away"
Lets make this very clear, Quran does not allow any physical violence with your wives.