YUCK to the poison ivy stories!!! That would be a really bad place to get it; for the love of all that is good please watch where you squat and what you wipe with if you're caught out without TP! As for the porta-potties, they don't really bother me (unless they're just really dirty). I had to use squat toilets a couple of times on my recent trip to Kenya, and almost dropped my flashlight (which was in my scrub top pocket) down the latrine at one of the clinics! It fell out of my pocket, rolled, and stopped just a couple of inches from the hole (needless to say, it was thoroughly disinfected after that). Lesson learned: be careful what is in your pockets when you squat.
2011 Surly LHT
1995 Trek 830