[aesir23]

I heard that soiling yourself is a natural, evolved reaction, meant to free you up to run.

So in a sense, soiling yourself isn't the problem--wearing pants is the problem. :)

As realistic as it would be, it would completely ruin so many games--most rely on a certain amount of dramatic tension, or at least romantic heroism.

So I like your idea of making it a character choice, but I wouldn't expect it to be a popular option. Wish fulfillment is too important a part of why people game.