Yeah I still have nothing to really add or subtract or comment on, even after quoting it, sorry yo.
But actually, now that you mention it, I think this whole blog really centers around the idea of "Selfish" being negative, which in fact it should not be. It's just a word, really it need not connote "damaging" or what have you... Biological sex drive is going to be perceived as selfish, because it seems as if you're doing it only to pass on your genes, there are even some schools of thought that believe the human body is nothing more than a vessel to accomplish that very thing... so really, it's more or less not bad-selfish (or abnormal) to be sex-crazed (especially at that age). The perception of how bad it can be or get, does correlate to your own personal views and morals, of course.
tl;dr **** all you want, we'll make more.