If you are recording, you are recording. I don't believe there is such a thing as a demo or a temporary vocal. The drama around even sitting in the car and singing into a tape recorder that's as big as your hand - waiting until it's very quiet, doing your thing, and then playing it back and hoping you like it - is the same basic anatomy as when you're in the recording studio, really. Sometimes it's better that way because some of the pressure is off and you can pretend it's throwaway.