I think many of you are not getting the point of this thread: the problem here is not mastrubating. It's masturbating to online porn.
If you occasionally beat your meat solo in the shower or while thinking of your girlfriend or while looking at a picture of Natalie Portman naked, that's cool and healthy on many levels... BUT if you're fapping to a bunch of overly hung black dudes with nuclear reactor dicks gangbanging a bunch or blondes with huge silicone boobs, you're essentially fucking up with your brain's chemistry and you'll eventually have trouble enjoying real life sex.