@Carol My wife and I have separate finances, we’ve basically split up bills and take care of any debt we have ourselves (student loans, credit cards, car payments), basically she spends her checks and I spend mine.
We make big financial decisions together (where to live, when to buy cars, job choices, etc) and do retirement planning and saving (currently for a home down payment) together.
Having it split was strange to me at first because my parents had always pooled their income, I just assumed that’s how it was done. Keeping it separate was what she was most comfortable with, we talked it through early, and it’s worked really well for us. The only times we’ve fought about money are when we’re just out of it and don’t have many options. If one of us has money, we both do, but we each have our own responsibilities.
For others, I think if you have different styles of money management then keeping it separate is probably the best thing. She plans her bills a full month in advance, gets paid every two weeks, knows exactly how much extra cash she has to spend, and keeps things balanced at all times. I tend to take it as it comes, my income isn’t as structured so I don’t plan as much out for day to day bills as I do longer term. It would drive her crazy if we were merge finances today.
Related to the original question, since we’ve been married we’ve each had times where we had to pull more than our fair share of the load financially. For me when she went back to school and for her when I started a business. I can’t speak for her but for me it’s one of the best things we’ve ever done for each other and our relationship. Even with our current separate finances set up, if she came to me and said we needed to work out some paperwork saying what belongs to who, who makes what amount, and who gets to take what if we split up, I’d be hurt. We’re working hard for each other and building something together, I think a prenup would very much get in the way of that if we were to try and divide things for our individual security.
It sounds great in theory to say better safe than sorry, but I think to actually apply it to a relationship, especially one that doesn’t currently have assets to protect, seems unnecessary and could really cause a lot of problems down the road. Every relationship is different, that’s just been my experience.