Should a Man walk in front of his lady?

[blockburna420]

My girl is always at my 1 o'clock , 3 o'clock or 4 o'clock , Im always to the left if we walking down the street

 

[Easy-E]

Yo, where can I go to find all the etiquette rules?

I've heard men are supposed walk in front, but, how does he open the door AND walk in front of her?