Microbiology.
Most germs on your cock are 'obligate anaerobes' that die in a dry oxygen containing environment. They breed quickly if moistened and gently warmed.
If you wash your hands and use a hot air drier, the bacterial count INCREASES.
Only wash your hands if there are individual, disposable, absorbent paper towels after urinating.
After crapping, there is a greater chance of spore-forming organisms; wash off with soap irrespective of available drying agents.
I never wash my hands after a piss if there is only a hot-air drier; piss is sterile anyway...
( da5id <YOUR SIG HERE>, Sat 1 Sep 2012, 22:11, 1 reply)

Interesting...
But not true.

Wash your hands, you grubby shit. Yes, piss itself is sterile (leaving out any questions as to whether you have any infections lower down which might cause it to be less so), but no-one really benefits from you spreading around your coliform bacteria, and your nether regions are most likely teeming with those. Granted, you'll never entirely eliminate your hand flora with soap and water - but it does wash away the skin oils surface bacteria cling to and, by extension, a fair proportion of the surface bacteria themselves.

On a more general note - sterile or not, most people really won't be that interested in getting close up and personal with your piss.

Snopes.
( Happy Phantom has been to Hastings, Brighton, and Eastbourne too, Sat 1 Sep 2012, 23:22, closed)

I remain with Sheldon on this one...
"Hot air blowers are incubators and spewers of bacteria and pestilence. Frankly it'd be more hygenic if they just had a plague-infested gibbon sneeze my hands dry."
( da5id <YOUR SIG HERE>, Sun 2 Sep 2012, 7:52, closed)

Oh right, so you take all your scientific knowledge from a shit sitcom that's usually wrong?

( BraynDedd Natasha Kaplinsky's labia majora, Sun 2 Sep 2012, 7:58, closed)

"All"
Indeed, that is exactly what I said. Well done on the reading there.
( da5id <YOUR SIG HERE>, Sun 2 Sep 2012, 22:26, closed)