Pornography is addictive.  I’ve been pretty sure of that for some time.  Now there is neuroscience on this point:

William M. Struthers of Wheaton College explains, “Men seem to be wired in such a way that pornography hijacks the proper functioning of their brains and has a long-lasting effect on their thoughts and lives.”Struthers is a psychologist with a background in neuroscience and a teaching concentration in the biological bases of human behavior. In Wired for Intimacy: How Pornography Hijacks the Male Brain, Struthers presents key insights from neuroscience that go a long way toward explaining why pornography is such a temptation for the male mind.

Pornography is “visually magnetic” to the male brain. Struthers presents a fascinating review of the neurobiology involved, with pleasure hormones becoming linked to and released by the experience of a male viewing pornographic images. These experiences with pornography and pleasure hormones create new patterns in the brain’s wiring, and repeated experiences formalize the rewiring.