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.
What were specific elements of Wilhelm Stekel's theory of physical impotence?
Related to this may be Stekel's elaboration of the idea that everyone, and in particular neurotics, has a peculiar form of sexual gratification which is alone adequate.
Was Wilhelm Stekel's theory of physical impotence published anywhere?
How did Wilhelm Stekel's theory of physical impotence relate to his other works?

Question: How was Stekel influenced by Freud?
Self-contained rewrite: How was Wilhelm Stekel influenced by Freud?