Random thought: does it have to be today's society? The idea about arranged marriages is good, but I kind of agree it's a little more unusual for this day and age... but if it was set in a different time period, or another Soulverse, you could make it so that it was an arranged marriage. *Thinking back to storybook days of princesses locked in towers or being forced into marriage for their country*
On a similar note, it could be an entirely different scenario. Say, perhaps, that (if Zara is either dead or had never been an issue) Clark was forced to marry a human as proof of an alliance between New Krypton and Earth. Of course, that would require a lot of manipulation of backstory and perhaps an Alternate universe altogether, but the fact that Lois and Clark were forced to marry against their will (each loving someone else, sort of like the Kal-El/Zara situation) could cause a lot of tension and resentment between them... just a thought.
