Funniest statement so far is the person that said it would be more understandable if she had done X-art than Facial Abuse (especially since she's done both, and those two sites have a much higher crossover of talent than you might think). First of all, in porn a paycheck is a paycheck, and as long as they don't do anything to you that you can't physically handle, most girls are willing to shoot for most companies, no matter how degrading.
Second, it's role-playing, the people that shoot the stuff don't actually hate the women, and the women on the site aren't as helpless as they appear. There are many women in the real world who are fans of rough sex (hell, look at the sex stories thread for some examples), and just because a woman actually commits it to film doesn't mean there's something inherently wrong with her (well, no more inherently wrong with her than anyone else that has sex on camera).