I think that's being a little unfair! Americans as a whole are not hysterical about nudity. God knows there's enough of it in modern society, and we're very tolerant of it -- if not the major source of it. It's just that there are certain conservative/religious groups that complain loudly about it, and outsiders mistake that for the opinion of everyone in the U.S. (which is pretty silly).
And you seem to be misinterpretting the reason for the controversy over that Super Bowl "wardrobe malfunction," miss. It's not the nudity, per se; it's that the nudity happened unexpectedly during a program with an enormous amount of people (and kids) watching. There's a certain level of "decency" that needs to be upheld in TV when anyone could be watching, and that level was broken. Was it an overreaction? Sure. But I don't blame people for having an issue with what happened.
Nudity does not need to be shot out of the country, by the way.