And people wonder why I refuse to take part in "potluck" lunches, or eat others' foods. I need to save the URL to this discussion.
I, too, cannot believe someone who does not use soap does not smell like a wild animal. It is surely a case of adaptation. Hoarders who live with hundreds of animals and urine/feces littering the floor claim they cannot smell the ammonia. They have adapted.
People of hackernews, wash your filthy hands with hot water and soap. (that's not an insult, it's an trivially-proven factual assertion: unwashed hands are filthy.)