Duh Fogs, it's not a *real* marriage unless you have kids.

About Amy's baby plotline from Season 6:
You tell yourself you’re married and it’s nice, it’s sweet, you’ve got a bit of paper, you’ve had a party, you share a kettle – but really you’re dating. That doesn’t feel tremendous. That’s where the idea of a baby started.

Thanks Moffat, as always, your wisdom astounds me.