National Lampoon's The Stoned Age (2007)

Set among Neanderthals in the prehistoric era, National Lampoon's The Stoned Age (2007) stars Adam Rifkin as a caveman named Ishbo who yearns to invent fire, eating utensils, clothes, and to enter the girl-cave of cavegirl Fardart (Ali Larter). But Fardart prefers Ishbo’s brother Thudnik (Hayes MacArthur), and to make matters worse, an enemy tribe is planning to attack Ishbo’s people. Supermodel Carol Alt also appears, but neither she nor Ali Larter get nude. There are plenty of uncredited nude-anderthals played by porn stars Darryl Hanah and Marie Luv. Sadly, much of their breast work was cut from the final edit, but it does appear in the DVD special features. That will turn you to stone in your pants.