As Julia, I think that the meaning of open minded is different for everybody. On my side, when I read '' open minded'' I always thought about kink, or a good listener for issue off the beaten track, but I was far to think that open minded is a way to talk about cim or greek.
Kink and boundaries are very personal ; one's vanilla is another's kink.
That being said, I don't think that you need to be open-minded to be an escort ; It takes all sorts to make a world ! There are people who prefer a more conservative approach.