It is not sex education, it is how to control your desire??

Well, for me, it is unfair if we ask the new generation to learn or to be exposed to sex education as there are some students who are really naive. What I would like to stress here is, why don't we introduce a subject of how to control our desire (nafs)? We need desire but how to manage it. Adults also would say, it is simply said but to put into reality, it needs a strong determination! Why subject on to control desire? Knowledgeable but without practicing it, it is useless. You keep on asking people to be good to others, but are you really "good" to others?