I personally dont have anything against waiting until after marriage to have sex...but I dont really follow by it. I mean...I'm a virgin but I, personally, am not going to wait that long.
But if that works for you two, then that's by farrr way awesome. It means that your relationship is not based around sex and that's great because you know that there are things that are more important and that you truly care about each other. And, for a guy to support such a decision proves that you are truly inlove with her and that you're a great person.