If your little
one asks you "The Question", you can semi-clearly utter, "Philippian tubes" and show him/her a
map of the northern-Aegean-Sea area. That way, you are giving an essentially-truthful answer, while still "keeping the conversation G-rated" --- i.e., without divulging any actual "
adult-themed" info. Plus said youngster will likely become either bored or "info-overloaded" while staring at the
map, and thus will forget about his/her original question.