An airport in holland has a fly painted in the urinal…apparently it saves on flying pee as it gives the pisser something to aim at. 
“I think it speaks to the duality of man sir.”
(Private Joker in Full Metal Jacket)
First size up your urinal. Satre it up and down. Then grumble and mumble at it. Then spit into it with contempt for it. Show it whos boss and that you dont have to pee here but do so by choice. Then disgorge your water with power. Grunt at the urinal. You have won. When you leave make sure to call it a few more names. Thats right you own that urinal cause you just marked it. Now call it a bitch just like it is.
Congratulations you have just finished male urination in public 101.
-G
I do it. I don’t know why. Maybe some ancestral spittoon-memory stimulates the saliva glands.
But it’s always before I start and (maybe) after I’m done. Never in the middle.
…but when you get blue, and you’ve lost all your dreams, there’s nothing like a campfire and a can of beans!