Marriage is a partnership. Duty? Maybe its my view of the word but I don't think I have a duty to act in a specific way according to some set rule....my husband doesn't either. We both contribute to the family. There have been times when he wasn't working & I was the bread-winner and times it was the reverse. If we had a 'duty' it was to the family as a unit, not as individuals. We divided responsibilities according to ability & situation.