"The research around the way that highly sexualized images affect girls is alarming -- including lower grades and greater levels of depression. The negative impact on self-esteem has also been directly linked to girls who measure themselves against the sexy stars in their lives. And is this really the way we want our boys to think about girls? The challenge of counteracting these messages necessarily falls to parents. And there are as many different ways of discussing this as there are kids."
The whole article is worth reading. It helps parents identify problems with inappropriate media and how it impacts our children.