Though it's billed as sort of a porn title fight in which Rocco Siffredi and Silvia Saint get it on for Biggest Slut bragging rights, sparks fly throughout this Prague-shot production no matter who's doing the nasty.

Siffredi reams the un-saintly Saint's pussy and ass twice, once in the back of a limo and the second time as part of a group grope that ends with the baby-faced blonde getting d.p.'d.

The scenes sans the marquee names rock as well, including searing three- and five ways, both heavy on the anal action and of course, the concomitant gaping asshole shots.

Points off, though, for being a 130-minute vid that contains only four sex scenes, yet makes room for excessive footage of some Czech adult trade show.