There is a gemara somewhere (Im sure Joseph has it bookmarked for such discussions) that says one who walks behind a woman is considered an am haaretz. So, to all frum girls on a date with a yeshiva guy, can I assume you are not interested in the am haaretz of the yeshiva?
when I was in shidduchim about 25 years ago, the accepted practice (and I dont know how both sides knew this, but everyone just did) was that the guy held open the door, gal walked through and moved to the side and guy came in and they continued walking together.