Take the following as truth: Eventually you get home, carrying no bags, wearing some clothes you can add to your own collection as souvenirs of your most recent stay--ready, of course, to offer them to your next houseguests in exchange for theirs.
Then the following statement: "It's unsanitary to exchange clothes because you get other people's germs on your skin." is true, false, or inconclusive?
Answer: Inconclusive