Oh no *gasp* someone might actualy see another human being in a completely natural state that we are all in at least once a day... NAKED! How horrifying. Or worse, the secret could get out that we in fact DONT reproduce with our clothes still on. And our kids might find out that God really doesnt hate nakedness so much that he knitted us sweaters that we're born wearing.
Or most horrifying of all... a parent could not supervise their own dang child and they got on eBay and surfed through an EIGHTEEN AND OVER contest and WON.... oh, the humanity. And then the careless parents get to keep the money... well, maybe then they could buy a kid filter.