When you have your appointment at the dentists office and the female (and/or perhaps male) assistant's breasts surround a side of your face whilst they lean forward.
Jon: "My dentists assistant was cold today, I could feel their nipples on my cheek."
Sam:"Guess you experienced a the dentits today."
1. fucking private, fucking secret, nobody's damn business;
2. containing information whose unauthorized fucking disclosure could be prejudicial to the national fucking interest.
Lewis and Clark didn't need to bother asking their Native guides for their cree-dentials, since anyone whom they hired was from their own area, and so they were all familiar with what the explorers would likely encounter in that particular region.