As usual, I suppose I am missing something obvious. I do wear underpants for hygenic reasons. No matter how good you shake it, a few drops will go into your underpants if you have them or your pants if you don't. Better into cotton underpants changed onceor twicedaily. And I suppose underpants would be useful if stripped searched at the airport or elsewhere. And I suppose the BEST and REAL reason I wear underpants is plain old habit. I've been doing it most of my life, after all.
So why did this guy encourage, almost DEMAND, that I go a week without underpants? He seemed really hung up (pun intended) on this topic. In any case, I intend to continue weaing my briefs on a daily basis.