Whistling = Affection?

Back when I had my 1 year old female kitty, I would sometimes find myself whistling- and she'd suddenly meow/rub against my leg as if she were in heat. When I would stop whistling, she'd return to her aloof self.

Why would Whistling make her act this way?

Because cats hear sounds in high registers better than they do ones that are low toned (opposite of dogs, really), and will respond to them faster. That's why when women (or anyone, I guess) call 'Kitty...." in a high voice, the cats come to us - and it might even explain why birds chirping drives them crazy (along with fluttering)!

Bubbles does the same thing. She loves whistling and tho she's not usually a "lovey" cat, she become extraordinaryily so when you whistle her a tune I have not noticed that Leela cares one way or the other so far. However Leela runs when you call her name.. Bubbles will meander over .. IF she feels like.. So we call Leela.. but whistle for Bubbles