If your female partner is not opening up to you sexually, sometimes (often) there is an unconscious fear of female power on his (or her) part. If men want more from their partner sexually, they need to expand their capacity to tolerate and appreciate female power. She has been told, her whole life, in so many different ways, that she is 'too much' including and especially her sexuality. And indeed she is a lot. Show her you can handle her fire.