TRIPLE HER ORGASMS!
This might sound complicated, but those who have played the game swear by it.  The Coital Alignment Technique (CAT) supposedly triples her chance of orgasm and gives you a better chance of having the simultaneous orgasm you thought only happened in the movies. 

Start in the missionary position, but then shift your hips a few inches up her body. This gives you a shallower penetration, and the shaft of your penis pushes up against all of her important parts. Resting your full weight on her, wrap her legs around yours, and synchronize your horizontal dancing so that your pelvic bone rubs against hers.

Maintain a steady pace and have two pairs of industrial strength earplugs handy for the "Oh my god, oh my god, oh my god, OH MY GOD" finale.