pluk
TS Member
In that situation when you know the couple then sure use he and she, but it's hardly necessary for someone you haven't met (as in, someone who you may use the wrong pronoun for)
Of course it is, say I'm dealing with a couple I don't know at work, handing over information to a colleague, he and she become very useful.
But more to the point, it's not offensive in meaning or intent AT ALL, so why change? At the very worst it's mildly awkward to make a correction if someone gets it 'wrong'.