Ha-ha, I wouldn't know, Mick!

The 'psycho-' in this case refers to psychological meaning the conscious and subconscious desires that drive sexuality rather than simply the biological imperative. 'Psychosexual Development' was an important part of Freud's theories and is a cornerstone of psychoanalysis.

I think, here, Elio Petri is using his protagonist as a proxy to put the broader society of his times on the analyst's couch...