Realistically speaking it's simply not feasible for a man to expect to have a woman at total and complete beck and call each and every time he wants to have sex simply if not only because women are people, too. That is to say there is a likelihood that may not want to give you want the way you want as much as you want for as long as you want it for. There lies the problem. Regardless of whether or not she wants to do it with you, your body is still demanding the strong desire to "get off".