Off the top of my head, I could probably come up with a thousand potential problems with living together unmarried (in the US). Here's a big one: if you work f

Off the top of my head, I could probably come up with a thousand potential problems with living together unmarried (in the US). Here's a big one: if you work for any church-based organization (and they are huge employers, e.g. operating large schools, hospitals and universities), they might fire you because they suddenly decide you are violating some arcane religious doctrine. Now you might say "I didn't want to work there anyway," but that's not how life works for most people who are not well-paid twenty-something software engineers.