I always thought that you should open a door for women and people who need assistance. And after you walk through, you look back and if someone is behind you, you prop it open so they could grab it for themselves. It's not done to impress anyone but out of common courtesy. I believe "common courtesy" is something we desperately need to hold on to, especially these days. So, whether it is at an doorway, on a train, in a restaurant, or in passing; common courtesy, making eye contact while saying thank you, listening, appreciation, giving genuine compliments, and smiling are few of the important things.
I too have some co-workers who are in the similar situation as Yuriko described. The husbands look unhappy as hell, but they feel that is normal and they are doing the right thing by being patient(がまん、がまん). And the wives(who do have it rough raising children) complain about not having enough money and complain about their husbands. Wow, this sounds like a stereotype of the modern Japanese family. Lol.
Going back to ladies first, in an intimate situation with woman...Yes, ladies first.
Unless, it's not that type of situation.