"It's So Amazing" and "It's Perfectly Normal" are written by the same author (the second one is geared slightly older). There is also a third book aimed at younger kids called "It's Not The Stork"

I should also add that while DS wasn't awkward, at first it did take everything I had to not be completely awkward myself (not sure if I succeeded the first time but I think I am getting better) wink Good luck!