This world tells us that love and lust are the same thing. The Bible tells us a very different story....
-1 Corinthians 13:4-7 tells us that love is patient, kind, etc.. This is the proper view of love that will bring lasting joy. We need to get this drilled into our thinking because the world is all around us telling us a very different story. The story they tell is all about lust. Lust gets you into trouble and steals your joy. It can even less to death (see Proverbs and the stories about "the immoral woman"). The Bible on the other hand, it teaches us how to make love a wonderfully beautiful thing that is centered on Christ and that brings true joy and happiness. It starts by following what 1 Corinthians says, and ensuring that its teachings become the way we think so as to truly change our behaviour.
-we need to teach the kids these truths. I think one way to do it is to continually point out where the world.i s wrong on this topic. We can instead point them to what the Bible says in 1 Corinthians, and many other passages, to show them the Truth. To show them what God says and why He says it and to show them how very wrong the world is. We need to also show them what will happen when we follow the world and its way if thinking, and then contrast that with the joy that comes from following God and His way of thinking.