Thanks for answering. A few more questions, if I might:

Why the terms "wife/husband" and not something else? (My own inclination is to assume that it's because there is less deviation from standard meanings than not, still rendering it a useful beginning place, but that's not your opinion or experience, which is much more valuable to me)

I guess I'd expand the same roots of the question above to 'marriage', too, if you don't mind.