Also, men used to walk on the right side of women, so they could draw their swords easily. When swords went out of fashion, men changed over to the left so's they could protect their lady-friends from dirt, etc, from the road. I have a male friend who still does the gentlemanly thing and insists on walking on my left. Gets really annoying though when crossing to the other side of the road or changing direction. Still, manners maketh man.
A lot of my male friends do that too
Took a bit of getting used to though
They found me a real pain though as a lot of the guys would work out the route for walking home to make sure all the girls had a guy to see them safely home
and I was always the one that waved them off and sent them off with the other girls who actually needed walking home
However, a couple of relationships started that way, with all the time it took for the guy to walk them home
Not that I'm a matchmaker at all