[enscr]

I think OP meant that washing is good for personal hygiene i.e. not carrying pathogens smeared around on your skin/clothes.

[baddox]

That's a valid point, but not one that directly supports the argument for bidets. Since most people (at least in my neck of the woods) shower at least once a day, personal hygiene is usually accomplished.

[pantalaimon]

But to prove that claim OP would have to show that people who just wipe their asses are more often sick than those who wash it each time.

[enscr]

So personal hygiene is a no-no until you can prove that you can get sick?