[baloneyman]

The point they are trying to prove is that there is no way of knowing what happens in the bathroom. It is theoretically equivalent to secrecy

[coldtea]

In the real world, though, 99% of the time, we DO know. And even if we don't know exactly, we can narrow it very closely. We either shit, take a bath, masturebate or whatever. We still want privacy of any of those things.