Why did my sims lose their Romance?

I mean this couple literally can't Romance anymore.  They have been happily married for a long time but since the update the option for Romance doesn't show up in their menu anymore.  I noticed that they can romance other sims just fine but they don't have the option with each other.

They are still completely friends but the Romance has gone and I can't figure out how to get it back.  They can Woo-Hoo and all that but nothing else.