A childhood belief about general

I used to think that all words for female private parts started with a B. I thought girls had boobs, a butt, and a 'bagina'. I found this to be a rather helpful way in remembering what girls had, and told a few of my classmates of mixed genders in second grade. They seemed to all agree that it was quite an outstanding coincidence. We called it "the three B's". I wonder when they figured it out...