Responsible Parenting

I just read a very interesting topis from a certain column of a magazine last night. It is all about proper parenting and the role of parents in guiding their teenager son when it comes to serious matters like vises , drugs and Sex. I am not a parent yet but I am done of becoming a teenager and I can say that i have been through a lot of curiosities during that era. Thanks God, I have been guided by my parents properly and I was able to find the right path towards a better career. Anyway, the article is all about "what are you going to do as a parent when some unexpected situation occurs?"
They said that there should be an open communication between the child and the parent. Let's say "Sex" for example. How are you going to explain it to your son? How long will you get deeper when you explain it to him? How will you tell him the consequences and the responsibilities that Sex can bring him into? How are you going to set limitations to him and how far these limitations could go?
Keep in mind that due to their curiosity , they are likely to be affected easily by the things that they see and they hear.
Let's take this first scenario. What are you going to do when you see your teenager son reading some pornography magazines or watching porn videos at http://pornxchange.com/ for example. How will you put yourself in such critical situation and how are you going to explain it to him? Just like what i have read in that column, it is very important to have a private conversation with your son regarding to this matter. It is okay to read such adult magazines or watch pornxchange videos or even reading some porn tube review as long as you keep yourself a limit. It is a part of being a teenager but then again, you have to know your own limitations and you have to set boundaries if necessary.
Second Scenario; How will you react when you found out that your teenager son's girlfriend is pregnant? Isn't too late for you to guide your son? Isn't too late to explain to him what he did? Of course, it has never been to late however, he cannot escape his responsibilities and whether he likes it or not, he has to bear all the obligation to that baby.
What I am trying to pin point here is the value of responsible parenting. Guide your kids before it's too late. Show them the right path towards a better future.