... eventually she happened upon a posture therapist. Apparently many average to tall women who are slim and have big breasts unconsciously slouch to hide their projection, over time she tells me this creates back problems that can't be addressed in any other way than posture correction.
She was so cured that she studied under this guy and opened her own practice. She says a lot of the relief of BR is a consequence of the breasts being smaller and not encouraging the slouching, so the relief is mostly not really a direct result of the size of the breasts.
I've been chanting this mantra for years now.
More explicitly, busty women tend to attract a certain sort of attention, and many (most?) tend to not want it. So they wish for some sort of social invisibility. Some get creative with loose clothing, scarves and the like.
But the whole slouching thing isn't just limited to busty women wishing to become invisible; it's just that they seem to be a pretty common example of the "if A then B" consequence. It wouldn't surprise me if there are obese folks who slouch with the same **61** hope of reducing their visibility.
If I had some ugly growth or scar on the front of my neck which I were self conscious of, I would quite likely be tipping my head forward so that my chin obscures a clear view of it. Tilting my head forward in that way would likely create strain on my neck muscles, and I would probably be complaining about frequent headaches. (Not that I'm comparing bountiful breasts to an unpleasant mark on one's neck.)
Perhaps this is why we rarely hear about women who get breast augmentations developing any sort of back/neck pain. It's actually quite common to hear about a breast augmentation boosting a woman's self-confidence, and with that added confidence it's reasonable to conclude that the woman isn't shuffling around with her head forward, gaze at the ground, shoulders curled forward, etc.