Yes, there are tons of sites cropping up such as throatpokers.com, meatholes.com, gagfactor.com, etc.
There is a very sadistic element to it, but that is nothing new to porn. Cumshots are a form of degradation, bukkake even more so. Anal is a form of inflicting pain. Even oral sex could be construed as a degrading act.
Why are these so popular? Because the internet has made new porn available 24/7, and people are desensitized to the softcore stuff. It doesn't do it for them anymore, so they have to ramp up the excitement factor. Kind of like developing a tolerance for a drug, I guess.
I find this kind of porn sickening, yet I can't help but be turned on by it.