I'm guessing Oink, you've not spent much time in an office environment.
If people are interested in dating each other, they do everything in secret. Whereas your work "spouse" thing is pretty open.
For the record, I've never had a relationship with someone I work with. One date, almost thirty years ago, and I was cured.
I have seen them work, one of my bosses married someone he worked with and they are happy together many years later.
On the other hand I've seen an inhouse relationship result in two people getting fired. And I would never be supportive of two people in the same reporting structure dating. Even if their common boss is three levels up, it still doesn't sit right.