Actually, at -30 you can lose tender bits on the outhouse seat if you don’t linger long enough to allow it to warm. It is an unpleasant experience, and if someone was in line ahead of you, the residual warmth in the seat makes it considerably less so. Stray air currents at that temperature (-30) can also adversely affect the elimination process.
Now I know why grandpa always kept that extra milk bucket in the house. He was a canny fellow.