This is nothing new, its just that very few women have the courage to try it.
As long as there are guys out there that see womens breasts being sexual objects this old trick will keep working.
On the other hand it takes a lot of women daring enough to be seen in public to make womens breasts an ordinary, everyday appearance. Where the line is drawn is in the eyes of the public.
I think it is simply another way women play mens hormones against them and women have full control of the outcome.
Time for an experiment girls, try this and let us all know how differently you were treated.