For slightly unclear reasons booking an aisle + window as a couple makes me feel uncomfortable. Then again, I am an (expat) Brit so have a firmly bred sense of Don't Break The Rules.
I suppose the nearest thing I can liken this to is when I'm waiting in a long line and holding a place for my wife. It's not that I have a problem with other people doing it, but it still makes me feel a bit uncomfortable.
Is there a rule that says that if a husband and wife are flying together, one of them must take a middle seat? Or even sit together?