Being able to marry in game, obviously it should have a debuff to the amount of xp (like you get 1/2 the xp that you should since there are 2 people working towards one level) that you earn as a collective and the things that you buy the price has to go up some not double but the price does need to go up. And if you divorce you keep half of everything you guys have to decide what to keep and lose half your legacy level etc