Dinner date with S. O?

Recently when I am out for dinner, I made some unique observations where a couple eats out, it is usually the boyfriend or husband that helps buys the food for both. Why is this so? Do u all think it’s guys duty to serve their girlfriends?
boyfriend/husband should help buy for both and serve food to table
girlfriend/wife should help buy for both and serve food to table
Both buy on their own
No rule depicting who should help buy dinner
Select gender and age to cast your vote:
Dinner date with S. O?
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