I can't imagine why anyone would want to have the circumcision operation as an adult, unless there was a medical reason for it. And in the case of a medical reason, then I guess the pain of the op issue would be secondary to the pain of the medical problem.

I don't agree with circumcision of infants. I've never heard a convincing enough argument to make me agree that removing parts of a child that are supposed to be there is a good thing.