She's supposed to be sexy, seductive, slinky, and sensual --it's what she does.
I thought what she did was steal things and have exciting adventures, sometimes featuring a complex relationship with Batman.
Different strokes for different folks, but I don't agree with your reasoning, particularly the adjectives "disturbing," "neutered," and "creepy." Bald or short-haired women may not be your idea of beauty, but I don't think the visibility of hair determines whether a woman is sensual or "feminine."