DTG, if you're going to make a bold claim, and even go so far as to say that it's "factual," you should have, you know, facts. A link to back it up or something.
Anyways, I don't think female characters are being used as sex objects that much more than male characters. They're just recognized a lot more for it. Hell, I could claim that Vaan from Final Fantasy 12 is a sex object. He has very little depth and dresses in metrosexual fashion.