^its got nothing to do with religion. watching porn is just as natural as masturbation. you cannot remove these dynamics of a person no matter how much religious dogmatic literature you throw at him.
Both are not natural, and one can live without them. Also as Muslim we can not consider anything without religious perspective because Islam is not just a religion but a complete way of life. Islam doesn't consider masterbation and porn as natural and I know people who have never been involved in these activities throughout their lives. Alhamdulillah.
p.s. If you are not a Muslim, then the above sentence might not be applicable to you.