There is at least one distinct reason that I would rather have not been circumcised, if I had had a choice. The only reason that I wear underwear is to prevent the irritation from friction that I would otherwise have natural protection from. It would be convenient and comfortable, and cooler in warm weather, if I didn't have to bother wearing underwear. Needless to say, when (hopefully) I have a son, he won't be circumcised, but underwear certainly isn't the only reason .