I can actually remember, when I was first discovering AB and Furry, trying my damnest to keep the two separate (I wasn't very approving of my ab tendencies) If I were to take a stab, I have always been in the furry mindset (I imagined myself Disney's Robbin Hood since I saw it as a wee lad) and I became a diaper lover in my early teens, not ever considering that the two could be related.