Seeing another person naked is having it within the walls of marriage. God design it that way. Marriage is some thing that both male and female are to complement and grow spiritually together. Watching porn is just causing more damage to what God has design it. Even went you are marry, you shouldn't cheat on your spouse because is another way of committing adultery. It is said in Matthew 5:27-30. read it. There are other verses to support my view on this dangerous topic but Jesus Christ does put it nicely and plain for everyone to see. There are no two ways of seeing this portion of scripture.
I tell you better not destroy what God has design and purpose for it. Here is a article about porn addiction does to the person. Don't go down that road. It does really destroy the real you that God wanted you to be.
click here (this article is to tell you how bad porn addiction is, it is not to help you get out of it)
If you need help, talk to your leaders or pastor or better your parents. It is better to get rid of it as quickly as possible than letting it be.
God loves you but hates the sin,