Rule of the Stinky Moo
Never tell your friends that your boyfriend/girlfriend has a physical-hygiene problem. You might end up married to that person & your friends will always know.
He violated the Rule of the Stinky Moo: John dated Sally for two months when he told his friends that she had a "Stinky Moo". Years later, John and Sally married, and now all his friends know about her problem.