[puts on his Donald Trump voice]
BUT IF WE ALLOW SAME SEX MARRIAGE, IT'S A SLIPPERY SLOPE TO OUR MIQO'TE MARRYING ... EWES... AND... AND... DODOS. Remember that time we gave women the right to vote? Did it not lead directly to exceptions made for common MOBS? This cannot happen again! I will not live in a world governed by THE MARMOT AGENDA and all of its loose morals!
I kid, I kid.
Yoshida-san is correct, however. The past ten years have seen a drastic change in same-sex marriage in some Western civilizations, but it's still very on-the-hush and under-the-rug in Japan if my understanding of CNN's doubtlessly spun stories on Takeshi Kitano's comments and the Disneyland ceremony incidents are of any merit.
I'm a firm believer in social equality and respect to concepts like freedom and consent (the latter of which is a construct largely ignored by most debates in the same-sex marriage circles).
Ironically, acceptance would probably come down to Eorzea's religions from a LORE standpoint as far as I'm concerned. Sure, in reality, marriage was a social construct that was co-opted into a religious covenant that has since seen a silent transition to a legal contract, but who says Eorzeans would do the same thing?
After all, Eorzea is based on Greek city states, and we all know how different the views on subjects like these were between entities like Sparta and Athens. Perhaps we could end up in a world where if you want to have a same-sex marriage in-game, you'd have to move the hell out of Ishgard to start with!
Just my two gil.