Sexuality cannot be reduced to a means for the propagation of life, for it is a condition of our enjoyment of or loathing of life.
He needs to address evolution here. Sexual desire can emerge in the psyche through natural selection. Clearly individuals without desire are unlikely to reproduce and this trait will disappear. Those with high sexual desire will produce more offspring and the trait will proliferate. Even if this is not the whole story, it must be considered as part of the story.
