Never. I've taken my brother out for food a couple of times, but I've never eaten anything myself. Everything I eat is homemade. Call me paranoid, but I don't trust someone else handling my food, or food that has been out on display for god knows how long before it makes its way to my hands.
...yes, I know all processed food is handled by someone. But that happens out of my sight, so it's a lot easier to ignore. If I see someone playing with something I'm going to eat I get overwhelmingly anxious. It also costs significantly more to eat out, and I'm not made of money =x
I do quite frequently. My mother loves to go to restaurants and its kind of a normal thing in my family. We usually go out twice a month or so and we also typically order food 2-3 times a month as well, especially when my elder sister and her boyfriend come over.
Not very often and never too frequently. Most of the time, I just eat normally, but I order food (like pizza) whenever I feel like it. However, certain fast foods can lower testosterone in men (if they are not in control of their own diet).
At least once a week. Three max. I either cook my own food in the morning and put it in a tupper for work or order/go to restaurants. No pre-cooked anything, no microwave-and-done, no middle of the road.
It helps that I don't drink or smoke or have any major 'daly' expenses so I can treat myself with that.
I order or takeaway about once a week or sometimes every other week.
Unless you count lunch, where I eat out almost every other day because I don't like cooking for myself if I don't have guests and it's the general culture at my workplace. I should start bringing more home-made lunches though to keep costs down. Today I actually have! :)