Tessa-
I went through the exact same thing. I had the biopsy, was dxd with hyperplasia, went on a three month course of Provera, had another biopsy. hyperplasia was gone (whew

).
If I were you, I wouldn't worry about sex affecting your condition. I never had any problems and I was under my RE's care the whole time
Of course, if you really think there might be some medical implications, then I would suggest asking your doc, just to make sure.
Good Luck
HTH
Aimee