This is not a joke. After all the joking we've done about "The Porn Identity," turns out Matt Damon thought of it first:

Of course Damon's point is, if you're going to reinvent yourself as an action star, then, do so in a less than ordinary fashion, referring to The Bourne Supremacy that he feels takes the genre onto a new level. But if he fails as an action hero, Damon says he can always take porn onto a new level. ""What I want to do is a character-driven porn movie!  It's all going to be about the characters and the porn's going to grow out of the characters and it's going to serve as character development.  Perhaps, he adds, maybe he'll end up starring in The Porn Identity!

source: www.filmmonthly.com/Profiles/Articles/ MDamonBourneSupremacy/MDamonBourneSupremacy.html