I have to comment on what Heidi S said.
Heidi, I do agree with much of what you said. Sex is a God given, normal, blessing. BUT....
It is intended as a monogamous relationship between married couples. How sad for your son and his girl friend(s). Sex isn't just about pleasure. It is a 'knowing' of another person. when that bond is broken it can be devastating. You say your are worried that your son might push too hard to 'get it' from someone. How do you know he hasn't? I don't know too many teenage girls who 'give it' willingly. they give it for love and regret it later. It is much better for your son's health and welfare to teach him to wait. He is much safer that way, and he risks legal problems if he is 18 or older and having sex with a minor. I believe that is illegal in all states. It is called Statutory Rape.
Hi Laura
My experience with my now 13 year old son has been wonderful. The best way to handle it is to take it as it comes. since each child develops at different rates, each will have questions at different times. Number one, let him know that he may have questions and that you want to answer them, so he can come to you anytime. Be honest, keep it simple. The deal I made with my son is that I will give him a direct answer to his question. If that causes another question, he needs to ask it. That way I won't give him too much information. Also, when we are watching t.v. together I will pause it and correct the messages coming across. He has grown through this process since he was about 9. He has made these comments.
Once in response to finding out his friend's dad had an affair. "that is like taking a treasure map to the best treasure in the world, and tearing it up and throwing it away"! Out of the mouths of babes! I couldn't have said it better my self.
More recently, now that he is in puberty, and we have had some very frank discussions. In the past he didn't know if he wanted to get married. (go figure!)
Now, he is looking forward to getting married so he can share that wonderful experience with his wife! (he is being encouraged to wait, and to seek a friend with similar views. ( a modified 'courtship' mentality if you will.)
Sorry to be so lengthy but after reading other's comments, I wanted to add this.
I recently warned my son that he may have 'wet dreams' soon. We discussed it comfortably, and I told him what I knew about it. Then I encouraged him to ask his dad any specific questions he has about it. Since I am with him 24/7, I am the more natural to answer the questions as they come up. My husband is involved, and thankfully understands the need to address the subjects as they naturally occur. I also make sure I let my husband know about any weighty conversations we have had, so he is prepared to answer further questions. God intended for us to learn from our parents naturally...you are the best judge of your son's need!