I have never been a very flexible person and I feel stiff during sex. I cannot move my body while having sex and I don't want him to do all the work. What can I do??
Try another position, or just relax a little and let what comes naturally happen.
You can practice moving around in your bed by your self. Move your hips up and down and sideways. Arch your back. Straddle a chair and move your hips. Lay on your back and pull your legs up close to your head. Try all kinds of poses when your alone. You'll figure it out quick.