Yea I get you. I guess ultimately many men are simply horny perverts (creators and consumers alike) who take gratification in sexualised females, hence it is made in the first place and consumed or appreciated by end users (gamers) too.
I guess it's also easier to do when the female in question is purely fictional, and thus there's even more creative freedom and suspension of disbelief afforded.
I personally would have thought as the medium matures we would have moved further from that kind of thing, and whilst I suppose to an extent it has, it has done so in a very limited way.
The irony of course is that such over sexualised female characters are still actually promoted and glorified by many females too, in cos play costumes etc. Hence you see so many scantily clad half naked women at comic con and other shows, dressed as some of these characters.
Some women evidently use the sexualisation of these characters to their advantage or for their enjoyment too, unless part of that is simply because there are too few non sexualised prominent female characters, or the ones that dress in such ways get the predominant bulk of coverage, hence our notions of female cos playing is skewed. I honestly wouldn't know as I've never attended one of these shows myself.
On a sort of similarly related note, I know this may open up a whole can of worms and anger some people, but I sort of feel a similar way, if not far worse, towards the sexualised childification of female characters. When you make anime esque female characters who look increasingly young to the point they look like underage teens or children, wide eyed, innocent, cutesy, immature, inexperienced etc, but with super revealing clothes, big ass boobs, massive heels and all the rest, and often put them in very overtly sexual scenarios too, it really just seems questionsble to me. Almost like an inadvertent draw towards paedophilia.