It is discourteous to treat your significant other harshly.
John and Jeff are married and John comes home from work to find Jeff hasn't made dinner.
John wants to convey his anger at not having something to eat.
John asks Jeff if he could please make sure dinner is ready in the future because he's exhausted and starving when he gets home from work.
John smacks Jeff across the face for failing to perform his duties.
Jeff agrees that's it's only fair that since he stays home all day he should have something ready for John to eat when John gets home.
Jeff reports John to the police for domestic assault and John is arrested.