Ask her to go see a film together and then after both of you will probably be hungry, giving you the perfect excuse to bond intimately over a restaurant table.
Once both of your stomachs are satisfied and you're in a very susceptible and relaxed state, it's time to up your game. Make sure you keep staring at her so she gets your hint, wide eyed and all so she doesn't miss you. Once you got her attention, that's when you pop the question "so, do you like anal". Works 8391/8400 times.