You're the last two humans on Earth. Would you repopulate?

Saw that show The Last Man on Earth. It looks like a pretty good premise for a comedy, but it got me thinking: if there really were only two human beings left on Earth, would they even want to bother regenerating the human race? Think about what that would involve: multiple births without modern medicine followed by inbreeding. If they couldn’t track down at least one other couple (or at least one other woman), it might be better to just let the species die and let something else evolve into our niche.

and why would anybody choose Tucson if they could live anywhere in the country but had no utilities? It’s in the desert. And why use a swimming pool as a toilet instead of digging a latrine? The writers of that show must be city people.