As a couple of friends who must resort to smut in order to pay the electric bill, Zack and Miri don’t just make a porno; they hit the bull’s-eye of the present economic zeitgeist.

Their aim isn’t quite as true, though, when it comes to meeting the expectations of a very provocative movie title.  Director-writer Kevin Smith’s “Zack and Miri Make a Porno” is an intermittently funny, almost never sexy, raunch comedy that has its moments. And by that I mean: It offers a couple of, um, very “creative” moments that push the envelope of politically incorrect explicitness and gross-out gagsterism. (The most memorable of which can’t be described in a family newspaper.)