How to set iPhone Bluetooth to be just for phone calls

Is there a way to setup an iPhone 4s/5, iOS 6, to use the bluetooth only for phone calls?

I don't want music, youtube, google maps, or any app to go thru my car speakers. Phone calls work fine because the car will switch to Bluetooth audio automatically for those. I usually have my car audio set to radio so no apps are audible in the car unless I manually switch the car to Bluetooth Audio but then I can't listen to the radio.