Your question is interesting and multi-faceted. A man ought to know, without being threatened, cajoled or otherwise manipulated, that he should treat his wife well. It's common sense, and just a good idea in general. Just like a wife should inherently know that she should treat her husband well. Sometimes women withhold sex as a form of punishment. It punishes and poisons the entire marriage, not just the husband. I think sometimes wives need to look beyond their manipulative behavior and do that thing that would be best for the marriage. It's called sacrifice. In a healthy relationship, both parties will sometimes sacrifice their own will for the good of the marriage.