I think it depends a lot on the girl and what her best feature is. If it's her butt or her hips, I like them standing nude, shot from the front or from the back - straight on. If it's her tits, I like them shot from the front, slightly bent forward. If it's her legs, I like her laying back, with her legs outstretched, possibly up in the air.
I shot a girl years ago and she decided to lay flat on her stomach and grab her high heels, bending her legs with the heels almost touching her butt... and her legs slightly open. She had a perfect, round, little butt, gorgeous long legs and not an ounce of fat on her waist. Great shot! That's one of the best pictures I've ever taken, or even seen. Sexual and sensual at the same time.