Freud's adventure-story teleology

It's a very simple formula.
The hero embarks on a journey, completing a series of challenges, surpassing a series of obstacles, on the way to his final goal.
Let's take The Lord of the Rings as an example - Frodo, our beloved Hobbit, makes the long journey from the Shire to Mordor in order to destroy the One Ring. On the way, he is attacked by undead swordsmen, the barrow wights, wolves, goblins, trolls, orcs, a giant spider, flying monsters, gollum, etc... and somehow manages to avoid getting killed. With the help of Sam, the fellowship, and countless others, he is able to accomplish his goal.
This basic structure - hero, challenges, goal - is shared by countless fables, films, novels, etc... From Homer's Odyssey to Jurassic Park.

When referring to the sexual progression of human beings from childhood to puberty to adulthood, Freud wrote:

"Each step on this long path of development can become a point of fixation, every joint in this complex assemblage can bring about a dissociation in the sexual drive (2006, pg. 213)."

Before that, in his "Three Essays on Sexual Theory" (in The Psychology of Love) Freud has outlined the three stages of sexual development of children: the oral, where sexual pleasure is gained through the sucking, chewing, etc; the anal, where, as an example, some children will intentionally "hold it in" in order to feel an odd combination of pain and pleasure at the eventual evacuation of their bowels; and the phallic, where their sexual energies are finally devoted to the genitals.

Adolescence, according to Freud, is a process of surpassing the Oedipus complex and directing one's attention to a goal - "the emission of sexual products (212)".

Finally, if the person's family life, experiences, etc allow them avoid developing fixations or making deviations in these intermediate stages, they will emerge as a person who is "sexually healthy". In Freud's universe, this means not neurotic, not perverted, and suitably interested in sexual intercourse with a significant other.

This is Freud's adventure-story teleology - The ultimate goal is (his conception of) sexual health, and the person must pass through a series of challenges (the three stages, puberty) in order to reach this goal.

The relationship between Freud's theory and the basic structure of adventure stories throws up some interesting questions, the main one being "which was first, the chicken or the egg?"

Either Freud had read/consumed many stories with this kind of structure, leaving a firm imprint on his mind, and then conditioning his theory...
...Or Stories with this structure are a reflection, a kind of "return of the repressed", of the basic structure of human sexual development.
I guess it depends on the extent to which one trusts Freud.

The other possibility, outside of the chicken/egg binary, is that Freud is simply using this idea of a journey towards sexual health as a kind of rhetorical advice for condensing his complex theories and explaining them to the uneducated reader. Indeed he does tend to deviate from this linear conception at times, and writes about multiple "mental currents" - an entirely different metaphor.