I'm sure some of what you are seeing is acting. And I'm sure some of it, whether acting or for real, is deliberately filmed that way to appeal to customers who enjoy that sort of product. And I'm sure some of it is because the girl genuinely would rather be doing anything else but she needed the money, or found herself in a filming situation she didn't expect.
Fortunately, there are plenty of women out there who do a credible job of pretending to enjoy sex in all its varieties, so, for every one who closes her eyes and keeps her jar clenched at climax time, there's at least one more who approaches the finale with a degree of enthusiasm that I can believe.


