Read again what I said about primary reason and secondary reasons. Reading comprehension is good.
So I re read what you wrote:
You notice that even with all the facts listed, the author neglects the reproductive aspect of sex. From the "modern" standpoint, sex is all about pleasure and these benefits, apparently.
I see nothing about primary and secondary reasons although you might think that you implied them.
While reading comprehension is desirable, it still comes down to GIGO.