In an article on the history of the tango, based around the "lascivious" nature of the dance and some obviously obscene titles of some tangos, he proposed the theory of tango’s brothel origins. He maintained emphatically throughout his life - arguably one of the major reasons that this theory is accepted by so many - that tango's origins were in the brothels.
In Borge's 1930 biography about Evaristo Carriego, he expands upon the conflicting versions of how tango began, but wrote:
Despite the divergences that I have enumerated and that would be easy to increase by interrogating inhabitants of the cities of La Plata and Rosario, my informants concur on one essential fact: the tango originated in the brothels.
Even as late as 1982, in an interview with the New Orleans Review, he said:
But the tango, the tango in Buenos Aires, as most people have written about it, was evolved in the brothel houses about 1880. And the people don't accept it because they knew whom it came from.