I think the fashion industry has over commodisizes sex, particularly with women.
But overall I don't think American women are. US women today have great examples of non-sexualized high achievers that they can see.
Some of the highest people in politics and business are women. Some women are inspired to follow them and some aren't
It's usually about choice and preference.
But for whatever reason, alot of women are attention seekers,

and the easiest way for them to gain that attention without any effort is through sex and/or sexualizing themselves.