Cowgirl - Sit all the way and rock your hips from front to back. Imagine yourself sensually riding a rocking horse for the move.
It seems that for positions that everyone has heard of, it takes a little skill to climax.
Squat face to face with your partner while he is on his back. Try alternating between shallow penetrations and deep pricks to target different areas of pleasure.
The key to determining a cowgirl sex position is choosing the right angle. Lean forward slightly instead of sitting up straight. This will give you the easiest and most comfortable penetration.
For added fun, try spinning back and forth, or spelling C-O-C-O-N-U-T with your hips instead of just bouncing up and down.