I don't know why, but I've just remebered a couple of interesting etiquette tips I've heared long time ago. Here in Egypt, it's considered good manners of a guy to let a lady come infront of him thorugh doors, into rooms , into elevators....etc. ( while him opening the door for her ).
This rule shouldn't be a fixed one, as it should be reversed when it comes to going up or down stair cases.
On going up, the man should lead the way so as not to see up the lady's skirt. While on descending down the stairs, he should lead so that incase she trips, she can lean on his shoulder to regain her balance.
No idea, why I remebered them