This is what my SO and me have been doing for 8 ish years now and it's great. We call it "pocket money". I can't complain when she spends it all on shoes and bags, she can't complain when I spend it all on beer and hamburgers.
When we were poor, we both only got a little pocket money each month. Now that we're richer, we both get more. I buy hotel breakfasts now sometimes (the buffet ones), on normal work days, in my home town. It's terribly decadent but hey, it's my money. Other people buy iPhones. I have nobody to answer to but me. It's lovely.
If budgeted for properly, this should in their reduce overspending because the amount you can freely spend is one you've previously accounted for as "an appropriate amount."
When we were poor, we both only got a little pocket money each month. Now that we're richer, we both get more. I buy hotel breakfasts now sometimes (the buffet ones), on normal work days, in my home town. It's terribly decadent but hey, it's my money. Other people buy iPhones. I have nobody to answer to but me. It's lovely.
I warmly recommend pocket money.