Twice recently I have seen women, presumably picking up their OH from work, get out of the driver's side door, walk around the vehicle and get in the passenger side. The man then gets in the driver's side and drives away. If I had seen men swapping to the passenger side as well it wouldn't make me wonder. I would assume that whomever likes to drive takes over. I can't think of a single time I have seen a man do this.
In our house, I am the main driver because I love driving and DH isn't fussed. I'm not so bothered about it that I would swap over if he was picking me up from somewhere though. Why bother messing with the mirrors and seat? It irks me because it smacks of the man taking the helm from the little woman now he is on deck IYSWIM.
Yes, I know this is a first world problem and it is none of my business.