Its always said in a joking matter but I know that theres truth to jokes, especially in one thats common like that.

This seems sort of beta. The saying implies that you can never win an argument with a girl. Is it a common saying because most married men nowadays are really beta? (hence 'beta' in beta providers)

Seems like a way of becoming submissive to your wife and she would lose all attraction for a guy that always wilts before her.