I'd say "proper" rather than "positive." The lecher certainly thinks sex is a positive thing(even a stopped clock is right twice a day).
No one has come up with a realistic way of legislating the effects of human hormones
Last I checked, I rule my hormones; they don't rule me. They somewhat usurped their proper place in my teen years, but I have since restored justice to my bodily kingdom. From personal experience, I can attest that hormonal control is possible, and far better than the alternative.
so what is the point, accept to teach truth and responsibility?
Teaching truth and responsibility is certainly a mighty strong point, and sometimes the law is indeed a good teacher. Discouraging vice is a good way to indirectly encourage virtue, because it helps develop the habit of self-control.
But I think governmental law is besides the point of this article, since modest societies can combat immodesty through non-legal avenues. The author is noting how we often do not respect the goodness of sex. A society that respected and cherished human sexuality would neither tolerate such widespread meat markets and guilt-free pornophilic "entertainments," nor would it eulogize fellatio on our Free Republic threads. This mutilation of human sexuality cannot help but influence our idea of what it is to be human. And if we change this idea too much, we could very well reject the principles of humanity upon which our nation is founded: That all men are created equal, and endowed by their Creator with inalienable rights. Would you like to see what happens when these principles are rejected? I don't think I would.