Heh...Becky...you might view it differently if your FI expresses feelings towards you.
Your thoughts might start to wander and not focused on whats at hand...like Flare to land etc?
I were suprised how much it affected her as soon as my collegue let her know that he wanted the same that she did.
As I said, the mind wanders I guess, and taking orders from someone that is sharing bed with you might be too much to deal with.
But..as I said, as long as she only had a good eye to him and he kept his feelings under control, everything were fine. So there is nothing wrong with having a potential model as a FI. Might be more inspiring to come to the airport then.