aaaaaaaaaaaaaaaaaaaaaaaaa
Oh this is a common one....
Easy to sort too, stand well back and ask her! If she looks keen go for it if however you find yourself ducking from flying objects forget it and text her about it again in about a week.. Should do the trick.
Then again, maybe when your having a bit of rumpy pumpy yourselves and you have got her very turned on gently introduce the idea as a sort of fantasy, see her reaction and go from there...
Mike