Spooning?

Good for snuggling on a cold day, also is supposed to hit all the right spots.

Another one that'll keep you both warm, if the guy is fit enough for it, is "upstanding citizen."  That's where you straddle him, wrapping your legs around his body and arms around his neck. He stands and supports you with his arms.  If he's strong enough, he can do all the work and you can go along for the ride.  That one is also good for hitting the right spots... and lots of fun!