The quote was by Suzy Quatro, who is being somewhat disingenuous here because she certainly used sex to sell records in her day, although far less overtly, because she was of her time. She posed for that bastion of equality and liberation - Playboy Magazine - wearing a leather catsuit.
Pop stars have always been sex objects - have you checked out the reaction to Elvis Presley's and Mick Jagger's early performances?
The fact is, times - and culture - move on, and twas ever thus.
the entire point about pop is tom bind you to your friends while simultaniously alienating your parents, so i would say that mnodern pop stars are simply carrying on the traditions of their craft.
How The Daily Mail as the agll to whinge about sexualising of women when it's on-line side-bar is a constant rolling review of scantily clad women and salacious captions.
Music has always used image to sell itself, and probably always will. You may not think of it as 'music', which it is, simply music that does not appeal to you, but music non the less.
Popular music reflects the society in which is lives - always has, always will.