Comment by skissane

Illegal in well more than half: the UN has 193 members and same-sex marriage is only fully legal in 36 of them, which is less than 20%.

If you look at a map of the world, it is only really a thing in Europe, the Americas and Australia/New Zealand. The only country in Asia with it is Taiwan, which is largely unrecognised and contains less than 0.5% of Asia's population. In Africa, only South Africa–arguably Africa's most Westernised country, and less than 5% of Africa's population. In the Middle East, only Israel – like South Africa, very much the "odd one out" in its neighbourhood – and Israel only recognises same-sex marriages performed overseas, they aren't legal in the country itself.

Not only is it only legal in less than 20% of the world's countries, countries in which it is legal are only around 20% of the world's population