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I'm surprised nobody's mentioned that some people literally can't piss in public. A stall isn't entirely private, but it's private enough that I can actually go. And it's fairly common, in my experience - being in stalls and hearing nothing but the awkward silence of the next guy standing at the urinal beside me for twenty or so seconds and then flushing to give the illusion that he actually took a piss.
No one here has trouble going in public?
^It really depends on your anatomy. Sometimes a bit of physical manipulation is required. I practiced in the shower for a while, using the drain as a target, but I think I'd need a SheWee to really do it mess free.
I will admit that I've never peed standing up fully clothed that I didn't get at least a few drops on my clothes, but usually I'm in the woods and am filthy anyways.