What I liked:1) Easy for kids to understand.
2) The bird and the bee help keep things light and comfortable. They help guide adults in terms of approaching this topic with kids, and they help keep kids engaged.
3) This book is thorough. You have something specific that needs to be addressed, this book will probably cover it.
4) It was non-judgemental, acknowledged diversity, and did not pretend that human sexuality and reproduction only means natural reproduction and childbirth, and that human families are only headed by married heterosexual couples. Families of any make-up have a strong chance of seeing their family reflected here.
What I didn't like:
1) This book was thorough, and sometimes I got little surprises as I read to the kids. The brief discussion about abortion in a book aimed at elementary school kids kind of caught me off guard, and the words to this passage were on my lips before I could even register that this was a topic I needed to clear with my sister before I read it to her kids. Masturbation was also given some ink. Fortunately, I was able to omit this discussion just as the first sentence was coming out of my mouth. The book was thorough, but on occasion, considering the target audience, sometimes it was a little too thorough. The adult reader cannot let their attention wane while reading this book, because that very next passage might have the effect of snapping your attention right back into place!