My stance on the issue of over sexualizing in games is that if you want to create a characters that look pretty, confident, and dare I say sexy but give them significant character development and make them feel like actual people and give them a reason to be in the story then go right on ahead and more power to you.
However if sexiness is not only the only reason those characters are there in the first place but it's done in away that's overdone, juvenile, and pandering (you know the tropes, Panty shots, chainmail bikinis, jiggle physics, etc.) I will not only feel insulted as a gamer but insulted as a man, and I probably won't buy your game even if I was threatened with waterboarding.