It depends, for everyone attractiveness means something else... For example i am getting sick and tired of "bombshells", they were ok for a while, until they were a few, but if every game nowadays shows milf which you would "never" meet in real life, that gives me an idea to make something different...
And that doesn't mean, the story progress will not have an impact on the girls, how they're willing to change their looks/habits...
I think it's just a point of view, what makes one horny... Some like fake bodies, monsters, bestiality, NTR etc.
Let's see where this goes...