Everything. Ages, marriage infor, past sex life, sexual experience from past and now, what is your sex life including up to this point? Does she masturbate? Do you masturbate? Do you each know of the other doing so? Does she play with a vibrator or dildo? Have you discussed fantasies, what are they? Does she respond to pics, vids or movies with certain hot guys in them. Does she like to watch sexy movies "Shades of Gray" type stuff or other? Does she seem to get turned on by TV shows that show sexy things? Do you catch her eye "wandering" at all? Does she catch your eye wandering at all? Tons of things. Does that help?