What affect does porn really have on men and their relationships? The common responses range from an unhealthy male sex drive to violence to encouraging promiscuity in women as a key to finding men but there is more.

From Carolyn McCulley's book "Radical Womanhood":

Some argue that today's raunch culture is a reaction to the omnipresence of pornography. In order to get and keep a man's attention, women feel the that they have to act and look just like porn stars. According to a New York magazine article, on Manhattan-based sex therapist says she's seen many young men coming in to chat about Internet-related porn issues. "It's so accessible, and now, with things like streaming video and Webcams, guys are getting sucked into a compulsive behavior," she says. "What's most regrettable is that it can really affect relationships with women. I've seen some young men lately who can't get aroused with women but have no problem interacting on the Internet. I think a big danger is that young men who are constantly exposed to these fake, always-willing women start to have unreal expectations from real women, which makes them phobic about relationships."

Feminist writer Naomi Wolf agrees. "The ubiquity of sexual images does not free eros but dilutes it," Wolf writes. "Today, real naked women are just bad porn."
Twenty years down the line from the "porn wars" of second-wave feminism, Wolf notes that part of what was forecasted then has come true now - and part was wrong. In an article titled "The Porn Myth," Wolf writes of running into antiporn feminist [Andrea] Dworkin at a benefit which caused her to reflect on what Dworkin had one prognosticated.
If we did not limit pornography, she argued-before Internet technology made that prospect a technical impossibility - most men would come to objectify women as they objectified porn stars, and treat them accordingly. In a kind of domino theory, she predicted, rape and other kinds of sexual mayhem would follow...
She was right about the warning, wrong about the outcome. As she foretold, pornography did breach the dike that separated a marginal, adult, private pursuit from the mainstream public arena. The whole world, post-Internet, did become pornographized. Young men and women are indeed being taught what sex is, how it looks, what its etiquette and expectations are, by pornographic training - and this is having a huge effect on how they interact.
But the effect is not making men into raving beasts. On the contrary: The onslaught of porn is responsible for deadening male libido in relation to real women, and leading men to see fewer and fewer women as "porn-worthy." Far from having to fend off porn-crazed young men, young women are worrying that as mere flesh and blood, they can scarcely get, let alone hold, their attention."

Additional Resources:

Porn-Again Christian - a frank discussion on pornography by Mark Driscoll, download it free here.

Carolyn McCulley's Blog