Why Do Men Love Starring At Ladies' BOOBS?

Let's be realistic here, no big deal about it, men can't walk past a pretty lady without starring at her boobs, why? and even when they are done with the boobs staring, they still turn back to catch a glimpse of the back to see if they are in equal proportion. So I have decided to ask the men today- why do you love staring at women's boobs? yyyyyyyy??

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