haha i would love to see that reaction.
my g/f always asks me if i'd get jealous if she was ever with another guy. i told her "no.. you know what, if you ever cheat on me, i'd just tell the other guy that you like it in the butt. and to not even ask if he can put it in there. i'd just tell him to ram it in there. i'd also tell him NOT to use ANY lube. it turns you on more that way.."
the look on her face was priceless.