Well, we had to watch an eductional movie in fourth grade where a woman givs birth, shown with all the gorey details. (Okay, it was cut short a bit, but that was about all the editing it got.)
I remember going home, still shell-shocked, and announcing that I was *never* going to have a baby.
But I knew before that that babies are growing in the mummy's tummy and that, somehow, they get out when they're ready since I have a brother four years my junior.
One story not mentioned before is the one about flowers and bees. (Never heard that one, but many references to it.)
Oh, and somewhere I heard the "God gives children to loving parents" part.