Girls of easy virtue

Freud's interests weren't changing, which is apparent from the letter of September 19, 1875, in which Freud, aged 19, was inquiring about Eduard’s erotic situation: Are there any Veronicas, Freud asked, with whom you can dance? (7) As the footnote explained: Because the German name for the flower whose genus is Veronica is Ehrenpreis (price of honor), the term is applied to girls of easy virtue. (8)
And, dancing, in Freudian symbolism, is a standard euphemism for having ex. Unfortunately, since Eduard’s response is missing, we cannot know whether Eduard was able to satisfy his dancing urges, although it is not impossible. As the Bible says, he who seeks finds. (9)
Maybe Eduard found more than he bargained for. Without a doubt, Freud was also an active seeker.
When reading Freud’s letters, and works, one shouldn't take Freud's statements at face value. Throughout his life, as well as in his youthful correspondence with Eduard, Freud used code words to hide the real meaning of his statements. As we have seen, he used the code word Veronicas for the girls of easy virtue.

The secret code

As Roazen recounted, Freud said he had a special "need for communication," at the same time that he felt it had to be by means of a secret code. (10) And, since his letters contained so much "dirt", Freud's need for a secret code is apparent. This kind of secrecy permeates, not only most of Freud’s correspondence, over the years, but also his writings. Thus, to understand the true Freud, one needs to be able to decipher his code.
Moreover, as the editor explained, in his letters to Silberstein, Freud used the word principles as a code for girlfriends. (11)
Thus, for example, in the letter of February 21, 1875, Freud, aged 19, explained to Eduard that, there was, a certain lack of principle(s) — the old ones are no good any longer and no new ones have been found. (12) Thus, having no vaginal option, Freud had to keep masturbating (not that he minded).
On March 13, 1875, aged 19, writing to Eduard, apparently jealous, Freud was unhappy having learned about, the first kiss you (Eduard) exchanged with your principle. (13) So sex was ok, but kissing girlfriends was not.
In the letter, of March 13, 1875, Freud, aged 19, discussed the question of kisses, using the code word for a girl. No doubt, thanks to personal experience, he wisely advised his friend how to deal, with your principle pointing out, that kisses tend to multiply so that soon, the facial area no longer suffices and (they) are then forced to migrate. (13)
What did Freud more specifically have in mind, and where the kisses were forced to migrate, will soon be apparent.
Again, on October 1 and 2, 1975, Freud mentioned, the marriage of a principle. (14)
Was he referring to one of the girls he used to have sex with?

Giving a free head

Sometimes Freud wrote the letters without using a code. Thus, in his letter of August 25 (?), 1876, aged 20, Freud had a sexual proposition for Eduard regarding Mina, the youngest of the Silberstein children. The girl was still in school, thus underage, thus making Freud a paedophile, not that he would've cared!
So what was Freud’s generous, as well as genital, proposition to his friend? Freud felt that he needed to convey to Eduard. a few words about your little sister, telling him that it would be unjustified not to give the girl her head. (15)
There's no doubt that the quote had been tampered with to hide its sexual connotations.
What Freud was offering the girl was, from his point of view, something more pleasurable. Without a doubt, what he wrote was that, it would be unjustified not to give the girl head.  
What Freud meant is obvious from the continuation of his thought. I think, he wrote, that on this point my view differs from your own, that you want to keep her in an incubator for refined young ladies. (16) Freud didn't care for refined young ladies, rather preferring sexual encounters with prostitutes, as he explained, among others, in his essay On the Universal Tendency to Debasement in the Sphere of Love of 1912.)
N.B. Freud liked giving head. In the letter to his boyfriend, Fliess, of July 30, 1898, Freud offered him the same free service. I would so much like to give you, he wrote, what you do not have: a free head. (17)  Of course, he wouldn't be charging his boyfriend for his services.)  
This oral procedure was in the future to be a mainstay of Freud's treatment of his, mainly female, patients.
(1) Freud, Sigmund, The Letters of Sigmund Freud to Eduard Silberstein, 1871-1881, (1990, p. 32).
(2) Freud, (1990, p. 34).
(3) Vice, https://dictionary.cambridge.org/dictionary/english/vice, 27.08.2023.
(4) Orthoinfo: Diseases & Conditions, Rickets. The American Academy of Orthopedic Surgeons, https://orthoinfo.aaos.org/, 1.10.2024.
(5) Syphilis, Blogs from The Natural History Museum: Inspiring a love of the natural world, https://naturalhistorymuseum.blog/2017/05/31/syphilis-in-post-medieval-london/, May 31, 1917, 1.10.2024.
(6) Freud, (1990, p, 89).
(7) Freud, (1990, 129).
(8) Freud, (1990, 130).
(9) The Bible, Matthew 7:7-11, New International Version (NIV), https://www.bible.com/bible/compare/MAT.7.7-11, 27.08.2023.
(10) Roazen, Paul, Review: Tampering with the Mail, The American Scholar, Vol. 60, No. 4 (Autumn 1991), pp. 613-614, 616-618, 620. (p. 620).
(11) Freud, (1990, p. 88).
(12)  Freud, (1990, p. 89).
(13) Freud, (1990, p. 99).
(14) Freud, (1990, p. 138).
(15) Freud, (1990, p. 161).
(15) Freud, (1990, p. 321).
(16)  Freud, (1990, pp. 161-162).
(17) Freud, Sigmund, The Complete Letters of Sigmund Freud to Wilhelm Fliess, 1887-1904, (1985, p. 321)., 

The American revelation

On April 4, 1912, the American psychologist, and Freud's follower, James 'Putnam delivered an address, “Comments on Sex Issues from the Freudian Standpoint,” to the Section in Neurology of the New York Academy of Medicine:' (1)
Responding to Putnam's lecture, one of the listeners, Dr. Moses Allen Starr, a New York neurologist, told him that he, knew Dr. Sigmund Freud well in Vienna some years ago.

Not an ascetic

This is what Dr, Starr had to say about his Austrian experience:
Vienna is not a particularly moral city, and, working side by side with Freud in the laboratory all through one winter, I learned that he enjoyed Viennese life thoroughly. Freud was not a man who lived on a particularly high plane. He was not self-repressed. He was not an ascetic. I think his scientific theory is largely the result of his environment and of the peculiar life he led.
Knowing Freud's predilection for sex, Starr's claim about Freud's way of life is highly believable.
Surprised by Starr's revelation, first two months later (sic!), on June 4, Putnam wrote to Freud, reporting Starr's claim: I felt very, very badly about Dr. Starr’s most undignified and discourteous and absurd attack, Putnam was upset about Starr's revelation. No wonder that he complained, stating: I, was so taken aback by what he said that I could not trust my words in answer. The attack wasn't absurd, it was Putnam's reaction that was. Unable to see the writing on the wall, right in front of him - Putnam chose to believe Freud.
Responding to Putnam, on June 25, 1912. Freud the notorious liar replied that he, had never known Starr and that the latter's revelation, about my early years amused me mightily. Would that it had been true!
That's interesting. So, Freud admitted that Starr's revelations were related to his early years when he worked in professor Brucke's laboratory!
Of course, it had been true. It is highly unlikely that  Starr would be able to invent impromptu the story of his working relationship with Freud.

Never known Allen Starr 

Notably, only three weeks after Starr's revelation, and long before he received Putnam's letter, Freud mentioned Starr's expose in the letter to Jones of April 28, 1912. Thus, he reported that, In the New York Times April 5th [19]12 there appeared a short article entitled “Attacks Dr. Freud’s Theory”, containing a ferocious assault of Allen Starr on' him.
As Freud informed Jones, in the article, Starr was explaining his theories by the immoral character of Vienna and the immoral life. One can only wonder what Jones thought about Starr's comment. Did he agree with the latter?
Further, Freud complained that no one of our people informed him of Starr's claim. I had to receive it from a patient visiting New York, Freud wrote. Again, he was denying ever knowing Starr stating that, it is more remarkable that I have never known the Allen Starr who knew me so well and in fact it is 23—25 years since I was last in a laboratory.
The denial isn't believable. As Freud himself pointed out in his reply to Putnam Starr was referring to, Freud's early years when he was in a laboratory with him.
And the "unjustly" accused Freud asked whether, wilful lying and calumny a usual weapon among american neurologists?" (3)
Judging by Freud's reaction, truth was a much more powerful weapon than lying. Freud wasn't hiding his dissolute life writing about it in his dream and psychopathological books. It is not a secret that Freud, not only sexually abused his patients, but also, was a keen visitor to Viennese brothels.

Fourth men at the table

Is there any corroborating evidence that Starr knew Freud and versa? There is. As Clark recounted, in New York, Smith Ely Jellile delivered an anniversary paper on “ Sigmund Freud as a Neurologist” to the American Neurological Association, ...Jelliffe had recounted that between 1882 and 1884 four men ... had worked together in Meynert’s laboratory.
Just the four of them.  Who were those four?
One was Bernard Sachs, who in the ensuing discussions recalled: “How well I remember those student days with Meynert. There at the same table we four men were working together—there was my dear friend, M. Allen Starr, lately professor of neurology at Columbia University, Anton, later at Halle, myself and a fourth man."
So now we know the names of the three participants, but who was the fourth wheel of the wagon? Unfortunately, as Sachs explained there's a problem:  Somehow I forget the name, he said, who was the fourth man. He needn't have to worry since, At this point the audience rose almost as one to shout the word:  “Freud.” (4)
So there was only one person who could be accused of wilful lying: the Viennese imposter, Freud. And now it is confirmed that during those years, and not only, Freud did, indeed, live a debauched life, and enjoyed it.
(1) Freud, Sigmund, and Putnam, James J., James Jackson Putnam and psychoanalysis: letters between Putnam and Sigmund Freud, Ernest Jones, William James, Sandor Ferenczi, and Morton Prince, 1877-1917, (1971, p. 32).
(2) Freud & Putnam, (1971, p. 143).
(3) Freud, Sigmund & Jones, Ernest, The Complete Correspondence of Sigmund Freud and Ernest Jones, 1908-1939, (1995, p. 138).
(4) Clark, Ronald W., Freud: The Man and the Cause, (1980, p. 498).