I put "never," because I was only counting my adult years. I peed by the side of the road a couple times when I was a child.

A couple years ago, I was driving to Mariposa when I realized that I really had to pee. Just then, as I was looking for a turn-off, traffic stopped dead. I was on a lonely, two lane country road. (I later found out that a semi had overturned across it.) My car was stopped, with cars lined up in front and behind, for four hours. I contemplated getting out and finding a bush, but the road was lined with barbed wire fencing, and there were no bushes. I'd have to pee within three feet of stopped cars, out in the open.

Let me repeat: jammed for four hours. And yet, I DID NOT PEE.