One thing that keeps you out of the grave is your immune system, and guess what, it needs practice. So while we're sharing anecdotes: I tend to wash my hands after eating, not before, I don't mind eating food that fell on the floor either, and I've been known to do stuff like lick a door handle to gross out others when I was younger haha.. and I hardly even get mild stuff like a cold, when I do it never lasts long, and I haven't had a serious sickness in my life ever (apart from skin cancer, which hardly counts). I can see how washing your hands after pooping makes sense, from all I read that is the smart thing to do, but other than that I'm with George Carlin: let's swim in some sewers, our immune systems will thank us for it. I'm not going to literally pay money to turn my immune system into a sitting duck, that's for sure.