GTTM,
As Steve2 and LisaRose and others have pointed out, do your job as a loving, respectful mate. None of you have suggested that you aren't.
If you are, and she is still behaving in this manner and you have tried to discuss it with her, quickly and quietly go to the best lawyer you can find and arrange a better situation.
Top marriage and relationship expert Dr. Tseday Aberra, a clinical psychologist, states that using sex as a weapon is the biggest mistake a woman can make. Find another way to solve the problem, she states. She also states that most women who have come to her over the years have used sex as a weapon against their husbands/BFs. She also states that it is critical for women to change their way of thinking in this area.
Or p.m. me; I have a lot of experience in this area. Women use sex as a weapon because they can. That’s all you need to know. You can do everything damn near perfect and a sizeable percentage of women will still do it. Those are the facts, and they are indisputable.