>>jasonc+(OP)
Sanitation is good, but too much sanitation is not so good. We're only just beginning to understand our relationship with bacteria, virii and micro-organisms. While sanitation was a great boon to reducing deadly pathogens, we're now in the process of swinging the pendulum too far, using antibacterial products that should really only be used in hospitals, keeping children out of the dirt (with growing indications that this leads to allergies), and generally living in fear of anything not institutional-clean. Our immune systems are beginning to atrophy from lack of "exercise".
Have you ever wondered why lovers touch their lips together, effectively sharing the bacterial brew in their mouths with another? I can guarantee that such evolved behavior is not simply coincidental.