In 1930, Magnus Hirschfeld published Sittengeschichte des Weltkrieges in German. Panurge Press produced an abridged, adapted English translation as The Sexual History of the World War in 1934. Another English edition was produced by Cadillac Publishing Co. in 1941. The last one, since 2015, is available to read free online through the Internet Archive. Chapter 12, "Genital Injuries, War Eunuchs, etc." includes the following information.
"Above all, it was shot wounds in the testicles and also injuries to the spinal marrow which induced a complete disappearance of the sexual functions. Injuries of this sort were not uncommon during the war which explains their frequent occurrence in literature. Yet it appears that poetry gave much more attention to this problem of emasculation during the war than did science. One of these cases became famous in medical literature because the patient became a subject for transplantation experiments."
Dr. Robert Lichtenstern reported having to remove both testicles from a soldier in 1915 in Vienna due to an infected gunshot wound. The patient immediately ceased to have erections "despite various devices calculated to arouse him"; he rapidly lost his facial and body hair; and
"he read nothing and manifested no interest whatever in the war....For the most part the patient sat near his bed or at the window, ate voraciously, slept a lot, and busied himself with absolutely nothing at all. The loss of both testicles resulted in a remarkable increase of adipose tissue, especially around the neck which gave the patient a peculiarly stupid appearance."
Doctors then transplanted another man's testicle into him, with these alleged results: "Various castration symptoms, such as adiposity, altered trichosis, loss of libido and psychic indifferentism, all receded temporarily so that the patient actually entertained the idea of marrying."
Dr. F. Pick's study found "commotion neurosis" in 10 out of 25 officers and in 7 out of 75 soldiers. These men were unable to ejaculate and in some cases also unable to get erections. Pick attributed this to physical and psychic stresses of battle, including sexual abstinence.
Several literary passages are referenced in this same chapter of Hirschfeld's book:
From an author named Bruno Vogel: "I saw Sczepczyk again. With amazing precision his generative organs had been shot from his body. 'Herr Leutenant,' he whispered, a little bit ashamed and in deep confidence, 'Herr Leutenant, and I have never yet had a girl.' He gladly accepted the cigarette I gave him and I softly stroked his hair and forehead. Finally I slipped my hand over his eyes and, as a little smile of pleasure curled over his mouth, I pushed my mercifully brutal sword into his side." The title was not mentioned, but possibly this was Vogel's Es lebe der Krieg! (1924).
The Siberian diary of Edwin Erich Dwinger The Army Behind Barbed Wire: A wounded soldier says that his wife (whose picture shows her to be "a perfect child-bearing machine") wanted at least six children. "Until now we weren't able to have any children because there wasn't any money for them." When he is told that he cannot have children due to his wound, "he turned around slowly and walked to his bed, stretched himself out painfully and never spoke to anyone else until they sent him to Siberia. It is significant that we meet the tragic figure of this emasculated man further on in the novel, but at this later stage, he rejoices that he does not have to suffer the sexual hunger which the others are being plagued by."
The poet Ernst Toller has a man named Hinkemann who "may be regarded as the final literary formula of the emasculated soldier who returns home from the wars, and the inability of his wife to continue a veritably inhuman sacrifice in his behalf....we are dealing with a group of men who will never be able to find their lost happiness by the side of a woman. From every outcry of Toller's hero, we hear the whole dismal and appalling tragedy of a creature who has gone through the vast hell of war, and it is a cry which can never be silenced. How brutal is the reply to Hinkemann by his wife's seducer, Paul Grosshahn, who rebukes the cripple for seeking to keep his wife a nun. Hinke- mann is informed by the seducer that he is in reality nothing more to his wife now than a ground for divorce!"