I found this hugely interesting: Share A Bottle.
My guess is that the wine is incidental. The real secret is that the couple is making time to be together away from other distractions. When you're able to reconnect, you're reminded why you got together with this person in the first place and reinforce the bond.
As a pair working different shifts, we don't get many opportunities to sit and have a drink together, but having read this, I'll certainly make more effort to try. You know, for the sake of my marriage and lifelong happiness.
And here's a current fave of mine. Check out the quirky bottle.