Well you are wrong and so when you are wrong, how do you plan to start being right? Even from a logical point of view, why do you think we would need two exit shoots when you can have one?
Urine comes from the blood. People aren't talking about crap, because it's not crap therapy. That's right! People have studied this. You have not.
So my advice is simple. Grow up because you won't be saving anyone anytime soon.