Americans in the USA feel very uncomfortable when confronted with Nudity in public.
Despite the changed views on many aspects, Nudity is still a touchy matter with Americans of all ages. Many other activities that were once considered immoral are now accepted by the public like masturbation, premarital sex, and homosexuality.
We are very sophisticated today on many other topics but not Nudity. Commercial TV avoids nude scenes (prime time), nursing mothers must hide their breasts while feeding in public, and some universities removed from their art history classrooms reproductions of some nude paintings because professors insisted on being uncomfortable and even offended by it.
Public Nudity is illegal in most states in the USA today, but if it was legal would you go naked in public??