My wife absolutely hates seafood. So, if I don't want to pick I just start heading in the direction of somewhere like Red Lobster and she'll always think of something else rapidly.
She'll do the same to me with something like a vegetarian place.
What's hilarious is when one of us starts heading somewhere we think the other won't like and they don't change it. We end up eating there and usually have a great time anyway. I've learned to like eggplant that way, and she's started growing more fond of Thai food.