We probably average once or twice a week- sometimes less, sometimes more- for "sit down" and maybe 3 times a month for take out. Usually we go to the local pub on their "deal" night; Monday is specialty burgers and a pint of beer for $10, Tuesday is 2-for-1 pizza, Wednesday is Wing Night (35 cents per wing). We also have a taquiria in town and a hot dog restaurant (both of these are counter service restaurants), as well as Mexican and Thai. If we go into the nearby "city" we usually eat at Uno, Olive Garden, or one of the mexican restaurants. It's mostly for convenience; I work until 6-ish, DH teaches until 8:30pm two nights a week but even on a "normal" night isn't home until 7-ish. I am often just too tired to mess up the kitchen and then have to do dishes that late at night!
Now that it's summer, we'll slack off on the eating out. DH isn't teaching, I'm not working, and we'll resort to using the BBQ for grilled meats and veggies most nights.