I was with my ex girlfriend for around 2 years and in that time she pissed outdoors quite a lot. We would always go for walks and while out she'd need to squat somewhere, in a forest, on the beach. You name it she'd peed there.
The best one was on our way back from a beach party one night, after a few drinks. The walk was about 4 miles from home but it was summer so still very warm. She ended up peeing 3 times on the trip home. Once on the beach, once at the side of the road and the last time was in a farmers field. Unfortunately we aren't together now so I don't see it any more!