There is something to be said for the good old fashioned outhouse with no tank, like the one my grandparents had years ago. They're usually so tiny that if anyone was going to be sitting up under that seat, you'd see the rest of them sticking out from behind--from 20 paces or more. The pervert would also be in the middle of flies, ants marching & spiders in addition to the poop & grandkids running around all over the place. The dirty bum wouldn't have a chance.