i work in an industrial plant, so it is rare that anyone shows any cleavage seeing as how it's 90% men, but when one of the females does show a bit of boob-crack, the crowd goes wild. i'm pretty sure everyone involved is aware of what the outcome of the situation will be from the get-go (the guys will look) so she either has to deal with it or wear something else. If guys walked around with part of their crank exposed it'd probably get some looks from women as well if somehow that were an acceptable part of the male wardrobe (the male version of cleavage?)
edit:
too much cleavage for the workplace