Originally Posted by Dexter Morgan

I don't think it's the jerking that has an effect on how you respond to a real partner, it's the visual stimuli of porn. Porn typically takes people to pretty intense heights of arousal very quickly, especially since porn is made and marketed to appeal to sometimes very specific types of fantasies. The bodies are "perfect", the women's sexual appetites are "perfect" (i.e., without context, willing to satisfy all whims, etc), the fantasies are perfectly crafted (say you've got a fetish for interracial pregnant fucking - that's TWO ways in which normal, un-pregnant wife is not as "good" as your fantasy). Before long, porn more or less gives you everything you want mentally, with the orgasm in the end. Real-life sex just can't compete, no matter how much you love your partner or how sexy you think they are.