I wonder about her position on masturbation.
Standing? Leaning against the stall? Prone? Back? Stomach? Is she a vibrator or pillow-humping kind of gal? Does she do the couch-arm slide? How many attachments does her shower head have? Does she like the realistic, veiny dildos or the smooth kind? Balls or no? Silicone or glass? Does she stimulate the G-spot? Ass play? Is she a squirter?
I'd go on, but there's no call to be gross about it.