A childhood belief about marriage

As a child, I thought that when people got married after a while they had children.. but that it was pure luck! Some people had one, some had four or five and some none at all, and that they had no say in the matter at all! I remember when my mother and her friends talked of someone having yet another baby, and so soon after the first one, I would ask "but it's not her fault, what can she do about it" and my mother would give me a dirty look meaning "Keep quiet!" I never wondered where the babies actually came from or how they were born. It was just so clear.. you got married and then waited to see what you were given!