Truth or Dare DAVE BARRY Sept. 5, 2004 When you've been writing a column for as long as I have -- six billion years this Tuesday -- you get used to receiving a certain type of letter. It's known in journalism as the ''I Dare You To Print This!'' (IDYTPT for short) letter, because the letter-writer challenges you, the columnist, to print the letter, implying you lack the courage. Generally you don't print it, for two reasons. One is, you get a lot of these letters (at least I do) and if you printed them all, your column would consist...