Didja Ever Notice ...

... how some (well, more than some, a lot) of guys have to be the driver when they're in the car with the wife?

I'm reminded of that almost every day because as I look out the window of my office, a fellow gets picked up by his wife each afternoon.  However, he doesn't get in the car.  She stops, puts their vehicle in 'Park', gets out, walks around and gets in the passenger seat while he walks over and gets in the driver's seat.

What's up with that?

Is his wife such a bad driver that they are in imminent danger of crashing if she's behind the wheel?  Or, is it some kind of man-card revocable offense to let your wife drive while you're in the car?