Well, isn't that me skipping through 90% of the stuff here because I want to know whether Asumi is going to find her childhood friend and the sex scenes are basically filler.
It might be best to wait till Asumi is over, and then skim the last 5-10 chapters. Sexual exploration and expression is an important part of the series, and I'd say the sex isn't filler so much as it's just not for you, which is entirely fair and very valid.
Since I think works like this, and works like Asumi, are both equally important even though they have opposite audiences. Getting more asexual and related LGBTQ media is important, just as LGBTQ media that embraces sex is also important. Having different forms of expression for different people and embracing all walks of life is valuable.