Yeah, so watch this video if you haven't, it has some interesting info, and it's basically an advise to quit watching porn, or at least to get it to a minimum. I'd also suggest to quit masturbating so often (assuming that's the case with most people). You'll feel better about everything else. It probably has some ish to do with dopamine levels and stuff.
http://www.youtube.com/watch?v=wSF82AwSDiU