Doggie Style works out best for us. He has a bad back that stops him from being on top. I am not angled right to be on top. Being on top really hurts me. I can lay on my back and he can enter me from the side, but I am not a fan of this position. I love doggy style. It just works out the best for us.
My favorite sex act would have to being receiving oral sex. I really enjoy receiving especially when they seem to be enjoying it too.