[It was a good question, and Di had to consider it for a while.]

Humans don't live very long, from what I've read. I guess they feel they need to early on? I'm not really sure, to be honest. That would be my guess.

[Which was a little sad to think about. She knew she and Signless had gotten together very early on their lives, but it wasn't something they had actively sought. Indeed, in Signless' case he had abstained from quadrants for quite a while.]