Due to much interest in this topic and a debate on Facebook, I'm reposting the links to my previous blog posts on The Codigos.
Those Mysterious Milonga Codes
More Milonga Etiquette
The Milonguero Way
Please remember that this is my perspective from Buenos Aires, and that I only attend traditional milongas. I believe the codigos are fantastic for many reasons, among them that the woman alone feels safe and in charge of her evening. The codigos were developed over a very long time for very good reasons. If some people don't like them or don't want to respect them, no problem; they can stay in their own countries or just attend the "alternative" milongas here that cater to young foreigners. There is not just one way to dance tango, nor is there just one kind of milonga, thank goodness. To each his own.