walmart does not carry explicit cd's. if a cd that is normally sold everywhere is parental advisory, then walmart will have that cd in a edited format
the sex pistols cd was not edited at all. they also have battle of los angeles by rage against the machine, which is explicit but doesn't have the sticker either, and it wasn't an edited version because i'm pretty sure there is no edited version of rage albums. it may be their philosophy not to carry them, but they do (most likely unknowingly, but that's beside the point)