I do a winter camp in NW. Wisconsin in February. We rent port a Johns for the weekend. There is a layer of yellow ice in the urinal by the end, and I think the seats are carpeted by the hair frozen on. (Kidding)
A friend tells about somebody he knew many years ago who went up somewhere in Alaska or Canada, and the had to go out to cut firewood in the middle of winter. The whole village went out. One guy had to answer the call of nature, so he slipped off a little ways. He was gone for a while so the the new guy went to check on him. He found the guy building fire (temps were something like -50). When he asked why, the old hand said in these conditions, you had to build a fire to go in, or you’d get frostbite on very sensitive areas.
I don’t know if it’s true, but it could be.