I was being facetious, kind of.
Routinely this question pops up on the boards, and I think the truth is that sweethearts aren't even on most of our radars. At this point, they don't legally exist for any org. but yours, so as organizations they do not register. To be honest, I do not often encounter active sweethearts--yet another reason why they do not register for me personally.
I never understand why people ask this question; except, I imagine, to start mess, because that is where these threads always seem to end up.