I don't know how it is in other South Asian countries, but Indian metropolitan cities are very modern. I knew all about it at the age of 10. And in "those times we didn't even have much access to the internet.
Of course, I got to know of this on my own. I studied in an all girls' school and I was in the boarding. So that made a difference, maybe.
Officially, we have sex education in school from the age of 13. But by then most people know all the details. Some probably even have practical knowledge.
Edited by PemaKarpo - 8 years ago