I feel as though I can probably give you a better idea of a good present by seeing pictures of said GF either nude or in a g-string. I have been on this earth a very long time and I have slept with over 4800 women and probably bought half of them xmas present so I know my stuff.
I learned today that an appliance is not a good choice. Jewlery is a good choice.
Also, you are not supposed to buy jewlry for your gf from a pawn shop. Although this sounds like a good idea, the ladies in my office did not think so.