Depends on the personality of the couple. Duh.
Depends on location and friends. We don't have any friends here so it's once 3-4 months but when in our hometown, it's more than week or some city where we have more friends once to twice a week. It all depends on both willingness of the couple along with if they have friends or not.
I’m married. We hangout with our friends (also married couples) at bars and coffee shops, maybe 2-3 times a week