In the evolutionary world of gender, males compete with males for female attention, and females compete with females for male attention.
But today homo sapiens females not only compete with other females, but they compete with pornography.
And in competing with pornography, females wear pornographic clothing for the same reason lyre birds wear their tail.
So we might say pornographic clothing is the equivalent of the lyre bird's tail.
To see the lyre bird's tail click on - http://www.google.com.au/search?q=ta...iw=960&bih=533