I'm one of those women who carries Purell wherever she goes. Car? Check. Purse? Check. Diaper bag (back when I had one?) Check, and how. Even my geocaching bag contains a travel-size dispenser. Yes, I know that germs build up healthy immune systems and all, and I don't go too horrendously overboard, but sometimes hands must be cleaned when there's no soap and water available. (And I have a theory that the alcohol in Purell denatures the essential oils in poison ivy, so I use the HELL out of that stuff when I'm caching in the woods.) Poison ivy-related use notwithstanding, you could be forgiven for assuming that I am quite the germaphobe.
And yet (I muse as I finish my breakfast) I just ate a large bowl of bacteria on purpose. 12 different kinds, even, 7-10 billion per serving, or at least that's what it says on the side of the kefir bottle. Yum, yum.