I'm not a great lover of this activity, but when DS1 needs to go and I am too far from home and not near anywhere with toilets, such as McD's, I try and find a drain or some appropriate place to let him relieve himself.
DS1 was nearly caught short a few days ago walking back from nursery, so I found a drain and shielding him as much as I could, let him wee.
Anyway, a girl of about 13 came past, did a double take and shouted 'Eurgh'(sp?) at the top of her voice. My instant reaction was to tell her to grow up .
However, it did get me thinking whether other parents walk past scenes like this and are sympathetic or secretly thinking that it is disgusting.
Like I said, I'm not a big fan, but understand when children are caught short.