Digilogic, My advice is to be gentle and nice. My first lover (if you could call him that) was horrible and turned me off to many things that I love today. Avoid the phrases:
"You're ruining my rhythm" "Stop moving that way" "I can never get off when you're on top so let's not do that anymore." etc. and yes, he told me these things. Come to find out he was the bad one in bed
because I've never had a problem since. Tell her what feels good and what you enjoy instead of focusing on the negative. As relic said, ask her about her fantasies and desires. Also, do not force her is she thinks something is gross. She shouldn't knock it until she tries it, but if you force her she will not like it and you may lose out on some pleasure. My advice is to get some wine and candles. Wine lowers inhibitions and candlelight is just sexy. I'm not condoning taking advantage of her, but it may make her more adventurous on her own. Good luck!