A HUGE turn on for me. But really it depends on the person and the lifestyle their leading. For someone else spotaneity isn't even an option its simply a "No-No" and this could be reasons varying from a hectic work schedule to someone who has other commitments - eg children. For myself personally I would find it a huge turn-off to be with someone who sits down and plans their life right down to the last hour on their organiser and I would loose my patience in a second, for goodness sakes lighten up!! Its more exciting if your going out with someone and everythings not planned all the time.