The scary thing is, knowing Southern Culture as I do, the girls mentioned are probably involed in a church youth group somewhere. This is not a matter of not teaching the right things; it's a matter of not reaching those whose parents can't or won't reach them.
Think about this Cam Girl quote if you still think it's harmless for your teenager to consume pop culture unabated:
"Britney and Christina are doing their own thing, and I think that's great. If they feel the need to show off their body to get somewhere, then so be it."