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Well to fulfill your pleasure if you not getting any sex from a girl, I guess.
It's not the pornography as such that is addictive, but the overuse of it can have negative consequences. Like any initially pleasurable activity it releases various chemicals in the brain - similar to those produced when using various drugs. Over time the effect of those chemicals is weakened but the brain still needs them to function - or it may go into a form of shock if the chemicals are suddenly removed. So the action continues sometimes with devastating consequences. There are also many inter-personal relationship issues that impact on the overuse of pornography -these may be more important when studying this issue than the chemical effects. This is a very complex issue so I suggest further research into addictions in general and then sex addictions specifically. Your doctor may have brochures about various addictions which will also give you some direction.
Because the useful concept of "addiction" has been absurdly broadened from the plain physiological syndrome to cover nearly any behaviour about which people tend to feel guilty pleasure. I say "absordly" because if can call pornography addicting you can probably call Facebooking or blogging or snowboarding or collecting stuffed animals "addicting," too, under the right circumstances. Which is silly.
Actual biochemical addiction is a different animal: when you are chemically addicted to a substance, you are at serious physical risk if you discontinue use -- you can become ill or even die.
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All these activities can cause chemical imbalances and some gamers/internet addicts have died as a result of their actions. I can be difficult to see these things as addictions until you see the end results and they can be the same.
If you think you know someone who is in a similar situation they may be extremely embarrassed about it and need help, so be supportive no matter what you feel about the nature of the addiction - it will be real to the person concerned.
If you have further concerns or need more information it may be appropriate to refer this to the Biology group.