I've run into similar claims in discussions of circumcision, also claims that certain men felt "butchered" in their current state, as well as first hand accounts of adult circumcisions where they didn't understand what the fuss was about. I was snipped as a baby, by dint of being an American male of a certain age, and was startled by the fury around the subject.
I think the strongest case against might be that STIs shouldn't be an issue until you can make your own decision, but then I can't imagine being 12 or 13 and having that question posed, much less seeking it out. Plus having to leave the organ alone for a week or two while it heals -- my heavens, you wouldn't be able to think straight. John Kellogg advocated circumcision for preventing masturbation (something you hear about a lot in these forums), to no avail I can assure you.
-- Andy