We all have our special comfort zones. Are you uncomfortable showing your cleavage or seeing cleavage on others? I would love to have some cleavage but with a barrel shaped chest my girls are kind of walleyed, as in off to the sides. Bras have been designed for all sorts of flattering profiles and what you reveal can be adjusted along with your head and neck exposure.
There is no doubt that western human sexuality has explicitly featured breasts for some time now. What else is new?