For anybody not a secret that modern culture is obsessed, sorry, priests. Such secular party girl like Kim Kardashian and Nicki Minaj, to create the image by its fifth point. However, they are not the first who drew attention to the place just below the back.
In 1950-ies the public excited Vicki Dugan. This model is used to wear dresses with extremely open back. By the way, it became the prototype of the cartoon sex bomb Jessica rabbit.