I have lived with my GF near P'lok since 2012. I went several years ago to ask for Yellow Book / Pink Card but was told that we MUST be married. Went again three months ago, same Amphur man who said the same, but when I pulled him and showed some legislation which says marriage is not necessary, he relented and after 4 visits and one from our village head man, it was issued. Obviously Passport, TM30, Visa & Retirement Extension are needed, and GF's ID, house book. Free of charge in the end.