They just shouldnt call it marriage and instead "bonding" or something like that.
Also they should just implement it silently without makeing a fuzz and probably no one will notice anyways.

Bioware handled the situation in SWTOR horribly.
They ended up offending all the partys. But i guess blame the publisher not Bioware.

We should just leave that "marriage" term to those who feel its their tradition/whatever/sacred thingy and invent a new word for people who love each other and want to promise themselfes to their significant other for the rest of their life.