Washing your hands after having a piss!
We all do it, but why?!
If anything, we should be washing our hands before having a piss.
Think about it: after having your morning shower, your nice clean cock slips into your nice clean boxer shorts and stays there; nice and clean. Your hands, however, they're touching every bacteria infested surface in sight - your keyboard, mouse, door handles, grab bars on the train/tube etc. Then when you go for a piss, your nice clean cock that was happy in your nice clean boxer shorts then gets covered in loads of bacteria.
It still makes no sense after all these years.