I agree that its important. I can remember my father talking about sex to me only once, when I was about 14, and it was only about the mechanics--coupled with the admonition to wait till I was married--but with no backup information.
In retrospect, I don't know that if he had more of a talk with me that it would have done anything to stop me from getting involved with porn. The reason I got involved with sexual addiction in the first place was an attempt to cover my emotional pain. I think the best thing that parents can do to keep their children away from this, or any other addictions, is to make sure they feel validated.
1- dont just tell them you love them, back it up by spending time engaging them in conversation or shared activities
2- be slow to anger (I can tell you from personal experience that if a parent gets angry at the drop of a hat, it will make the child afraid of the parent)
3- never, never use gilt trips on your kids
4- encourage them to succeed, but don't tell them what success means--they have to figure it out for themselves. (my parents made certain that I understood that unless I went to college, I would never amount to anything. I did go to college, but it did nothing for my feelings of self worth. I wonder today if I might have been better served if I had learned a trade. Only God knows ... and I try not to think about it because I do believe that I am where God wants me now.)