This is always a fun topic that tends to go off the rails.
We've been together 8 years, and not married yet.
We split our rent/utilities 50/50, and live in a place that we moved into when making 1/3rd-1/2 of our current income. We don't keep score but we alternate who buys groceries, our individual vehicles, cell phones, gym, eating out (alone), etc are covered by our own separate accounts, retirement accounts are also completely separate.
I tend to pay for more of our leisure or entertainment spending category. Happy hours, meals out, booze, road trip expenses, etc. Which I'm completely happy to do.
We have varying urgency to get to FIRE, and I've put a lot more time and energy into my career/income, while SO is very frugal, she's been underemployed most of our relationship, which is totally fine with me :)