This Fleshy Hunger refers to that craving that consumes a man and takes up all his thoughts and possesses him with one intent, to satisfy those desires.
The title is a term used to describe sex addiction but it could also describe various pathological yearnings.
The man is no longer in his home, or even in his own mind and body. He is elsewhere, in a manic reverie, in another imagined place.
He looks insane, possessed, in his imaginary relish and exquisite torture.