Wow, I just started checking out this thread. It's been going on for a few years!!! One of my favorite subjects too. Now, I don't have any pictures but I can tell some of my experiences. I'll try not to make too long.........
I used to be pretty brave about showing my junk in public. Walking, riding my bike, driving in the car...
I used to do a lot of long distance drives to visit friends from college. At that time I did NOT have an air conditioned car and a lot of those trips were during the summer. A lot of times I'd get hot and sweaty and start getting drowsy. When I started feeling like that, I always thought taking my dick out, getting naked or whatever while driving was better than falling asleep at the wheel.
There were quite a few times when I drove thru small towns, stopping for lights and all that and just driving in my underwear.