Hey Donna, did you know that men find breast cleavages appealing because it's the anthropological equivalent of seeing the division between the buttocks. Same reason that (in general) women find tall, strong men appealing (cos they will breed strong children) & men like the curve of the hips in a woman (cos they are more likely to have trouble-free, live births).
So next time you (the collective female you) show off that cleavage just remember that in that primitive part of your brain involved with reproduction of the species, you are trying to attract a male to your buttocks.