If you guys do/or-will have a significant other, and when you die...do you want the other to find someone else or remain faithful? Yes, there is that whole "death till you part" or whatever, but if I die, I'd prefer she find someone else. I would never want anyone to be alone for so long just for me, even if I die at 80 and she has just a few years left on her lifetime.
My father died 5 years ago and my mother refuses to find someone else, even though I wouldn't mind if she did. I think my dad would have been okay with it. I can't imagine sleeping in a king size bed all by yourself for so long. I mean my mother is 39 years old...she has a VERY LONG life ahead of her. But I never bring up the subject anyways.