Conversation so far:
What was Wilhelm Stekel's contribution to the psychoanalytic theory?
Stekel wrote one of a set of three early Psychoanalytic studies of psychical impotence referred to approvingly by Freud: Freud had written a preface to Stekel's book.
Did Wilhelm Stekel work with anyone on the theory of physical impotence?
Freud had written a preface to Stekel's book.

Question: What were specific elements of the theory?
Self-contained rewrite: What were specific elements of Wilhelm Stekel's theory of physical impotence?