The reason, it seems, is that the toilet stalls in question are shared between boys and girls, and boys are not good at aiming. Sadly I can attest that many men are bad at aiming and do not clean up after themselves. But the funniest thing in this whole saga is that Vidar Kleppe, the chief of the Democrats Party, is outraged about this decree and claims it is interfering with God's work.
"When boys are not allowed to pee in the natural way, the way boys have done for generations, it is meddling with God's work," Kleppe said, "It is a human right not to have to sit down like a girl."
Somehow I doubt Amnesty International will be writing up the school for human-rights violations.