Mark, Stephen and Brian were three men leading perfectly normal lives. Yes, each of them was married. And yes, their sex lives were somewhat boring. Sure, there were things each of them would like to change about their wives. But that was just the way things were for married men after all.

And then they met Max...

Max was new in town, and he was interested in making friends. He was a doctor from South Africa, he told them, but his practice was a little unconventional. The three men were skeptical about some of Max's claims, but he was all too eager to show them the things he professed were true.

And soon the sex lives of these three friends would never be the same again...