A seedy British song written in 1939 poked fun at Nazi leaders' testicles, and kicked off with the line "Hitler has only got one ball." According to historians Jonathan Mayo and Emma Craigie, that's only, well, half the story. Their 2015 book Hitler's Last Day: Minute by Minute takes a look at Adolf Hitler's manhood via medical records they say they've accessed, and the two assert that Hitler suffered from "two forms of genital abnormality," per the Telegraph. The first, an undescended testicle, was said to have been confirmed by another historian in December. The second is hypospadias, "in which the urethra opens on the under side of the penis." Though hypospadias can be accompanied by other conditions, Craigie clarifies in an email to the Independent that it would be a "leap" to say the condition led to an abnormally small penis in Hitler's case, as has been reported.
The CDC—which says half-a-percent of male babies born in the US have the condition—reports that untreated hypospadias can snowball into future problems, "such as difficulty performing sexual intercourse or difficulty urinating while standing." Hitler's sex life has long been a subject of debate, with some arguing he was "repelled" by sex (ostensibly due to a fear of STDs) and others asserting he and Eva Braun enjoyed a typical sex life. In an April 2015 discussion about the book with the Gloucestershire Echo, Mayo doesn't address Hitler's penis, but he does recount other unusual facts he says he uncovered, like this: "At the same time that Hitler's body was being burned, Winston Churchill accidentally set fire to his clothing and had to be put out by a member of staff." (Another claim: Hitler suffered from "uncontrollable flatulence.")