Non-porn sites have an infatuation with turning their content racy in order to get a rise out of their readers, but even I have to admit that this is a pretty cool conceit. Vice (link below) paired real orgasms with fake ones into five videos and then offered up the challenge of picking which one is real and which one is fake.
For example, here's our good friend Bonnie Rotten faking it and making it. Which one is which?
Did you guess? It's #2, obviously. Feel like playing again?. Here we go...
#1 that time. The correct answer is #1. So yeah, fun, right? Head on over to Vice for three more.