I was married for 11 years, with the ex for 13 - hopefully FREE in a few weeks. We had four children.
But as memory serves, barring pregnancy, I initiated sex more often than not. I can honestly say that he turned me down more than the other way around (this rarely happend). When he wasn't acting like a complete tool, he was getting it MINIMUM 5 days a week....but then again, I have a very high drive.