We were probably a little more honest with our kids about Santa than most parents. We had to explicitly tell them to “keep the secret” from some of their cousins. Thus we avoided little unplanned revelations like this (thanks to Rob for forwarding it to me).
But our girls did somehow manage to find the contents of the top shelf in the work room with both volumes of The Kinsey Report and other books that had more photos that words. Which reminds me. I think there is still room on that shelf for this book.