My theory is that when your stomach is full, it constricts your bladder a little. So when you've had a poop the pressure is off and you're free to pee. In fact, I always take the peeing as a sign that I'm all pooped out and ready to wipe.
I have found that I have not completed the poop job until I have pissed - when I have the urge to piss I know I am finished and I can wipe my *bleep* at the point!
yeah i've been trying to troll this place to *bleep* for like a year and a half now, and the *bleep* who runs this site only ever blocks my grandmother;s ip, so i use one a church or something, he;s *bleep*ing dense