The idea that porn objectifies women is a myth.
The woman always seems to be the focus, whether it's a rough sex, whore abuse type scene, or your standard vanilla porn.
If anything, the male is the "object" in these scenes; you rarely see the face of the guy whether he's a stunt cock or a pornstar, and the scenes usually concentrate on the satisfaction of the female, whether she's dominant or submissive.
I've always had these bookmarked as decent studies and references:
http://www.hawaii.edu/PCSS/biblio/ar...mes-japan.html
http://f1000scientist.com/article/display/57169/
http://www.toddkendall.net/internetcrime.pdf
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Exposure to porn also seems to take out the mythic and holy, sacrosanct aspect of sex, and brings it down to a normal, healthy, necessary function of the human animal, like eating, dreaming and laughing; another level of instinctive, human interaction - which goes toward explaining the correlation between socially accepted porn consumption and reduced sex crimes of every type.
My two pennies... :D