Another thought though: What does the law say about divorce in your state? Sorry to bring up the d-word! I think most states view assets and debts acquired during the marriage as both of yours, unless you have a prenup stating otherwise. So if you are married without a prenup, does it make sense to pretend your stuff is separate, since if you divorce the courts will view it as joint and divvy it up equally or equitably? (I mean you in a general way, not the OP or any specific person.)
My partner and I are legally married but keep our finances separate. We've talked about this issue and intend to not go after each others assets if we ever split up. I think we'd be decent enough to keep to that commitment. We have a few friends who were married and didn't go after each others assets when they divorced. (Obviously, if we were a different couple and someone had stayed home to raise kids (or cut back on their career) while someone else worked it would be fair to divide assets acquired during the relationship, but that doesn't apply to us.)
That sounds good and you guys talked about it all first, although I wouldn't do it. Don't mean that as criticism for you, people should do what works for them.
Here's why I wouldn't do it:
If your getting a divorce it most likely means you are not getting along. Even if you still agree to not go after each others assets, it could put one spouse in an advantaged position.
Spouse A: "I want half custody of the kids."
Spouse B: "Well I am the better parent, and I'm legally entitled to a big chunk of your retirement account so you should be happy with what you get."
Also, if any family members or friends get involved, they may convince one spouse they didn't get a fair deal during the marriage and should be compensated, even if the couple had a solid verbal agreement about everything.
Unpleasant stuff to think about, I know. But it seems there are so many couples who love each other so much while together, and then have a nasty divorce. Good to know some of your friends were able to work it out.