Toilet Paper

This normally isn't a polite subject, but with two girls, we go through a lot of toilet paper. What I can't understand, and I've seen jokes about it so I know it isn't just me, why it is that only a mom knows how to thread the toilet paper on the spring-loaded toilet paper holder??? I mean, the roll would sit there for-EVER until it invariably fell into the toilet ruining the whole thing. Arrggg!