We each have our own bank accounts, credit cards and personal expenses. I have no idea how much or where she keeps her dough, and she doesn't know which mattress my money is stuffed into. However, my wife is of Scottish extraction, and I've never had any worry she would be foolishly parted from her money. If anything, she's a bit too good with money - bless her. I've seen her agonize over whether she should spend a few dollars on something as frivolous as a new pair of winter boots, even though her current pair has a hole and lets in the slush.
Every married couple has their own way of looking after household bills.
Some pool their money and pay everything out of a joint account. Some guys I know hand over their paycheque and get an allowance. We've never fallen into any of these money routines. In fact, none of our friends understand what we do. After ten years or marriage, we still pay bills like we're roommates.