We go shopping at the markets once a fortnight, so we kind of plan what we will be eating for the fortnight then (but not what on which night). Often the night before or in the morning we will look at what's left and decide what we feel like. Occasionally neither of us will want to cook so we will just get take away. We both cook, it probably averages 50/50, although sometimes one of us will cook several meals in a row - it always works out though, we both like cooking.