While social permissiveness is distinctly a phenomenon of the west
How about Japan or Taiwan? Reminder: Taiwan legalised gay marriage in 2019!I don't like to use the term "Western" too much. It's more clear to say "modern". Example: Japan is not at all Westernized, nor Taiwan, nor South Korea, but they are definitely modern.
-- Edit --
As a counterpoint, I would say that India (in my limited experience on-the-ground) is way more social conservative than Sri Lanka. I was genuinely surprised by the social permissiveness in Sri Lanka. It was a world apart from India. Thus, I would say Sri Lanka is on-the-cusp of being considered modern (in my eyes).