For about two weeks into a cycle I would feel great and my sex drive would be through the roof. But it would start to decrease throughout the cycle. I felt good overall, but not when it came to sex. I wanted to know why. So I did some research and found Royal Medical Center and got answers. After doing blood test I found that my estrogen levels were very low and that was causing my sex drive to slack. Now that I am on the estrogen replacement therapy I am feeling great in the gym and in the bedroom!