Why won’t my iPhone learn curse words? Can I force it to?

Back in the early days of the first generation iPhone, the iPhone was a liberal, open-minded hippie device that would learn any word you threw at it. The iPhone dictionary, like it does for most words now, would adapt to even the filthiest word you could muster after you had turned down its suggested correction 3 times. However, somewhere along the line — Rupert Murdoch, the Waltons (of Wal-Mart, not TV), or maybe the people who own Blockbuster Video — got a hold of the iPhone dictionary and blacklisted words they considered offensive.