It's a title that must have led to a considerable amount of online video-search disappointment.
Carla and Lou discover, when waiting for respective boyfriends one day, that they're dating the same guy. Guess who?!
Downey Jr. is Blake, the eponymous Guy, who's having his cake and eating it.
Even RDJ has a problem charming his way off this fish hook. He manages it, though.
Not only that - he even gets the girls to reveal that they, too, have been unfaithful. And makes them both want to have sex with him. God, he's good.