Wash the groin sweat off your hands afterwards

Wash your goddamn hands after you pee. It splashes.

I had someone suggest this to me once. His logic was that he knows where his dick has been and showers daily.

I subsequently came across a "Straight Dope" article that debunked it. It's best to wash after.

True, I try to wash my hands before as well if I've recently touched like a public library doorknob or something but sometimes it's an emergency and I'll use the sides of knuckles like scissors.

This is how the pros do it