I was thinking about this. I know that I have read that in some very conservative countries (Iran perhaps?) it is fairly common for men to identify as woman because it is illegal to be gay. I'm sure it's not quite as simple as that, but that's the gist of it.
But what about the countries such as Afghanistan or Saudi Arabia where being a woman limits your freedom to the extent of not even being able to leave your house without an escort? Leaving aside the fact that they almost certainly wouldn't actually 'live as a woman' in such a society, I'd be really interested to know if there are any men in these societies who have ever felt that deep down they were meant to be born female. And if transgenderism only occurs in some societies but not others, would that not disprove the idea that it is innate and not a social construct?
I hope that made sense, I know in my head what I'm thinking but it's hard to explain.