There is objectivity only because most normal human brains find those things attractive, therefore if your brain was not wired the same way, it would be possible to find completely different things attractive.
And then there's conditioning, which is based on your environment and experiences affecting you rather than your genetics; this too can change what you find attractive.
--
http://i498.photobucket.com/albums/rr345/Rakaputra/pjbasis.png
SuperNiceDog - 1, pjbasis - 0