I agree with captainlezbian's and your posts below regarding compromise and compatibility in a sexual relationship, but what you need to realize is that in this context "denying sex" is saying no ever, for any reason outside like extreme medical circumstances. In the culture being criticized by the OP, a wife must serve her husband at all times. They spin it a number of positive-sounding ways to make women complicit in their own oppression, but it comes down to her lacking rights and agency as an individual.