If anything, watching and whacking off to too much modern porn jades you towards "regular" folks (such as those without pierced, tatttooed and waxed gentialia who don't have squirting orgasms) and makes you less likely to have a good time when you discover that your actual partner doesn't live up to such utterly unrealistic standards.
Porn is a fantasy, but it's been with us ever since recorded time. So have drugs. People are going to imbibe pleasurable things, either physically or mentally, and history has proven that forcing things undergroud, so that they become a form of taboo, has never, ever stopped them.
You cannot legislate human desires, a/k/a/ morality. Although we've been trying to so for millenia. The biggest, hugest point of moral consternation that has raged upon the ages, and still manifests itself this very day, is how terrible it is that Women Get Horny. Female sexuality = OMG SCARY SHUT IT DOWN NOW!!!1!!!1
Someone really ought to finally do something about that... Cue Rick Santorum in 3, 2, 1...