I do it all the time now. I remember when I first tried it. I was 16 and at a public beach at night and was feeling daring so i just whipped it out of my jeans when I felt safe that no one would sneak up on me. It felt sooo exciting and risky. Kids stuff right? Well I was always brought up to be very modest and that my penis was shameful at best and was told by family members that my large penis was vulgar. So to do that then was really freeing.
Now, I'll admit to doing it now on most occasions to show off. I love getting reactions to my "vulgar" dick. I don't get crazy and stand way back or any thing to be super obvious. But I've found that just other guys natural curiousity does the rest. If they walk in and see ya with your hands on your hips and can hear the tinkling, it seems to set off the WTF bell and they wanna check out whats goin on. I get a kick out of catching guys stealing glances. So what? I've finally learned to accept myself and my body and not be ashamed. Let me get my kicks.
I personally have never pissed on my feet at a urinal or had any such problems. Once got some piss on my leg but that was again at the beach and the wind suddenly shifted. But I digress, Normally for me its like this, with jeans i just unzip, pull out my dick and push back the zipper flaps so that they are closest to the base and they will help to keep my dick forward and angeled out enough to avoid any mishaps. sometimes though if I'm wearing slacks where the material is thinner I have to change my stance a little, turn more to the right cause my cock hangs left and tilt my hips to make sure my stream hits the bowl.
Now my cock hangs a bit more than 6" flaccid and my balls are hangers, so I dont know why others have such a hard time, but oh well. I guess the main reason why I do it is the same reason why a dog licks its ball.......