<p>Pom-poms, tiny skirts and big smiles are cheerleaders' trademarks, but the eternally perky sets are flashing a lot more than pearly whites on the sidelines this football season.</p>
<p>The teasing sex appeal of classic cheerleading uniforms has been replaced in Philadelphia and a few other stadiums with mini two-piece ensembles that flash skin from cheek to cheek, stirring a variety of reactions from fans.</p>