A Nuance

So, two men are sitting in a room reading books, and one suddenly stops and asks:

"Hey, John, there's a word in my book and I don't know what it means".

"What word is it, Jack?"

"Nuance".

"Well, drop your pants and bend over".

"Why?!"

"You'll get it, just do it".

So, Jack complies, pulls down his pants and bends over. Then John suddenly slams his dick down Jack's asshole:

"You see now, Jack, you have a dick in the ass, and I have a dick in the ass... But there is a nuance".