What do men think when they look at a woman’s chest/boobs?

I notice male friends often glance down at my chest (not in a disrespectful way) but I often wonder what they’re thinking. This happens even when I’m fully clothed with a jumper on and no skin visible etc.

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Do men only look at the chest of women they’re attracted to? Or do you look at EVERY woman’s?
What do men think when they look at a woman’s chest/boobs?
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