My usual trick for finding out info i need is to play 20 questions, and every 3 or 4 questions ask something i need to know, e.g. "what's ur favourite breakfast in bed". The great thing about "what makes u sneeze" is that its random enouhg to be slotted in after a few cycles as a normal question. And if its online, I can just pretend I just sneezed and go "oh well i just sneezed on my keyboard so i think life is asking me what makes u sneeze".
So I pulled this off with my new gf (took a while, she's not stupid).
Annoyingly, she apparantly never sneezes except when she's ill. But she has a bad immune system so I might be lucky.
And people, 20 questions is the answer. Remember