I have taken two etiquette classes over the years. One provided by the USMC and one required when I worked in creative for a giant corporation and had to wine and dine clients. In addition to learning table manners, we were taught leading a woman through a restaurant, and down stairs, and following her up stairs. When practical men are supposed to open and hold the door - except where narrow confines would place your body too near an unfamiliar woman's body. I later worked for a wonderful woman who happened be a lesbian. My early door-holding efforts led to a bemused laugh - both because she was my boss and because she said I was treating her like some fainting damsel. At her request, I stopped trying to hold doors for her.