I can see how porn desensitizes one to sexual stimuli. What I don't see is how porn creates more or less sexual harassment.
Open your eyes, lib--PORN IS THE ROOT OF ALL EBIL IN THE WORLD.
But really, the arguments for porn being correlated with more sexual harassment generally favor the idea that the typical porn doesn't actually reflect reality and complex social interactions; and that young people are learning how to interact socially through porn--or at least that it biases/conditions people to expect certain things in social sexual situations. Eg, that women will always respond to aggressive male sexual advances, that men need to be the aggressor/initiator in the relationship, that women are there for men to have sex with.
The problem, imo, is that people are way too complicated, and there are too many other factors to consider (non-pornographic media, like romance films, television shows, etc) to lay the blame solely on porn. Can it exacerbate the problem? Probably. But I suspect that the problem (proclivity to sexually harass) has to exist already--and then porn is incorporated into the rationalization of dumbass behavior.