The door rule:
Is someone over 60? Hold the door for them.
Is someone carrying so much they don’t have a spare hand? Ffs, hold the door.
With your sweetie? In my relationship, I always let him hold outer doors. I hold inner doors, saying fair is fair.
Big group of people leaving some place, hold the door. They’ll speed up! (Not always altruistic)
Person struggling with dolly? Hold the fn door.
My door rule: if a human being is close enough to hold it for the sake of being considerate without making them feel like they need to pick up their pace to be polite in return, I hold it.
They don't need to be holding anything. For true, (as ML would say) after coronavirus shit the fewer hands touching the door the better anyway.
In my relationship, literally whoever is closer opens and holds the door for the other. Sometimes I get there first, so I open and hold it for him. Sometimes, vice versa. There's no conscious effort about it.