Use a video camera to tape yourself while having sex. Hook the video camera up to a small projector hidden in your closet, but don't tell your partner. While on top, turn the projector on so that you can see the video on the wall above the headboard. Your partner who is on bottom wont be able to see it because they are looking at the ceiling. This way you can watch your own porn as your making it.
He didn't start out so good but kept getting better. Turns out he was using the "hidden projector" and was able to critique himself as he went.