"Henry Miller is an incredible writer. Make that the reason you read this book. Maybe you've heard some bad things about Henry Miller, that he is a pornographer, a filthy, sex-obsessed old man with delusions of grandeur, etc. I wouldn't dispute any of this, but Miller also happens to be deeply perceptive and committed to as unsentimental portrayal of his own psyche as he is capable (which is to say, highly). Sexus is the first in a fictionalized (sensationalized?) autobiographical trilogy, dubbed The Rosy Crucifixion, in which Miller details his rise to literary prominence/infamy/relevance in the voice of an eponymous (probably not too altered) alter-ego.
"What I want is to open up. I want to know what's inside me. I want everybody to open up. ... I know that underneath the mess everything is marvelous. I'm sure of it. I know it because I feel so marvelous myself most of the time." (397)
P.S. If you do insist on identifying Miller with his coitus obsession, consider Sexus a primo alternative to Fifty Shades of Gray."
The first book of a trilogy of novels known collectively as "The Rosy Crucifixion". It is autobiographical and tells the story of Miller's first tempestuous marriage and his relentless sexual exploits in New York.
The other books are "Plexus" and "Nexus".