Do you and your significant other share a bank account?
My wife and I have a joint checking account and two joint savings accounts. (different banks) We have both names on credit cards and the mortgage. The only thing separate is our student loans. (because they won't let us consolidate)
I thought this was just something you did; get married and things become "ours". No more "your" money and "my" money. It is now "our" money. I see more and more couples that keep separate checking accounts and then either split bills half and half or do some sort of percentage based on income. Surprisingly, to me at least, I even know older that couples have separate accounts. This seems like a lot of work to me to try to keep things separate and fair. I just don't see the benefit. I would think it would cause more arguments over who is paying for what. It does make it a little tricky to surprise the other one with gifts, but there are ways to cover your tracks.
So, do you keep your stuff separate? If so, why for?