Having been on enough porn shoots to witness the protocol, I truly doubt this following story:

WWW- [reported by The Sun] – JOHN C. REILLY regrets visiting a porn movie set because one of the actors broke off a sex session to shake his hand.

The Walk Hard star was researching the role of Reed Rothchild in the 90s classic Boogie Nights and was horrified that the porn star didn’t wash the boldily fluids off his hand.

“We walk onto one porn set and this guy is giving this girl the business,” he said.

“The guy’s handling his joint, and they’re sweaty, with make-up dripping everywhere. It’s a gruesome scene.

“Then the guy recognises me, says, ‘John C. Reilly! I’m such a huge fan!’ and goes to shake my hand. I’m like, ‘Oh God,’ and he’s like, ‘Don’t worry! I was using the other hand!’ But he wasn’t.”