Go ahead and let it fly, but expect a deer to show up just when you put down your weapon and pick up your gun.

I've seen the debate a few times about whether or not deer get spooked by human pee, so I've experimented over the last few seasons. Twice I've had deer, both bucks,come right up to my tree, sniff at where I made really loud noise on the leaves (Good hint Mike), adn then casually walk off with no sign of alarm. Since seeing that, I'm not afraid of peeing while on-stand.