Hasn't anyone here seen the movie "A Bronx Tale"? The idea was obviously to make sure a prospective girlfriend passed the "door test". Any girl who did not pass the door test was to be dumped immediately. The guy is to, as a gentleman should, unlock the passenger door from the outside and open that door to let his date into the car. If she is a worthwhile girl, she would then reach across to unlock the drivers door. Lol probably not true but I've used that test on every girl I've dated...and it's accurate!