Obviously there might be people who regularly visit such porn related sites.
Basically we muslim should keep in mind that we have been assigned very big responsibility from Allah.We should very humbly take in to consideration that we have been watched by every one in world.No one but our religion is under criticism when we do any wrong in the world.When any body commits any unlawful thing non muslim start blaming Islam with out knowing what Islam preach in this regard.Also they donnot consider it some one personal offense rather they make generalisation that all Muslims are corrupt.
So friend it is up to us to bring dignity to our selves and Our Religion by not visiting such material.
I hope iam successfull in conveying my point of veiw