Worst experience was riding on a full stomach and then having to take the meanest dump in my entire life with no opportunities to evacuate. I finally found an isolated spot and ditched into some bushes to do the deed. I had no paper or anything so I just pulled the shorts up and started riding----big mistake. i was itching and burning within fifteen minutes.
Thankfully, I had two water bottles on me. I pulled over and went into some more bushes. I used the water in one bottle to clean my ass and the other to wash my shorts. Problem solved.