Think of the (other) children!
When I was a kid my little sister had a doll with a cassette player in it and a mouth that moved so it could tell stories and sing songs. It didn't take long before me and my brother popped a Guns n Roses tape in and had it singing welcome to the jungle.
I'd love to know just how much of Mattel's server time was spent on teenage boys trying to get Barbie to say something a bit rude.