Considering the stellar cast and comments in other forums, and the availability of "Director's Cut" and "Family" editions, I was expecting a sex comedy with dinosaurs. If you want one of those, see the much more entertaining _Dinosaur Island_.
This is a dumb cave man comedy, with women who expose their breasts now and then. Considering the Los Angeles women in animal skin bikinis motif, the costumes are not particularly flattering. There's very little sex in it, and the ever-radiant Griffin Drew gets very little screen time and hardly does anything but smile and sunbathe a little.
There are some stop-action dinosaurs, but they're rather stiff and simple. There are also some real lizards that only make the stop-action dinosaurs look even less real.
For a better dumb cave man comedy, see _When Women Had Tails_ or _Cave Man_ For the definitive babe in a doeskin bikini, _One Million Years BC_ still has not been surpassed.