The honesty and effort you put into that earns a response, even though normally I don't really get involved in discussion for this title.
It's worth pointing out that the way this title
started was good enough to earn my interest. There are plenty of bad manga out there but I don't get into them to begin with. The problem with this was is that it started out really good and had the potential to continue being good. It is that unrealized potential that frustrates me as a reader.
Most people will point to the absurd retcons as the reason this became bad. And they have good reason, but that's not really what it is for me.
For me, it's that the premise which was right there in the title was abandoned pretty quickly. This claimed to be, and for a short period was, a story about a guy who liked a girl who freely had sex with other people. That was a massive anomaly in manga: actually accepting a relationship style that was not mononormative, without it being a harem? That is extremely rare and got my attention right away.
Unfortunately, the author did not have the guts to stick with that, even though he had enough to defy his editor for the sake of a (bad) threesome. Quickly, it became a story about the main character wanting to claim his love interest for himself. And his love interest also quickly showed changes in no longer being so comfortable with the way she did things.
It's a lot like when you spot a manga about some guy falling in love with an overweight girl, only for the manga to pivot immediately to her losing weight. Like why do you torpedo the one unique thing going on on the story? (A Bouquet for an Ugly Girl is the one exception I'm aware of for this; all others immediately pivot to weight loss.)
Now, there's a lot left in this story that is..."unique", but not necessarily anything good. Like the way all these random girls suddenly fall for the MC out of nowhere with no reason at all. It's beyond the harem thing; in a harem, the MC is usually an honest, forthright, and positive person. Or at minimum, there's a lack of other options as love interests (e.g., they all live together in a dorm or something). But none of that applies here. The MC is an overall shitty person with little to be attracted to, and yet everyone at this point is just falling all over themselves for him--even though they usually have reasons specifically to dislike him.
Additionally, there's the big issues with the art which have been present for a long time. If you want, go through a chapter in the 50s or whatever and look at just how many times Gotou is drawn with the same stupid gaping OoO face, because the mangaka evidently has such a small quiver of available expressions he can draw. It has been dozens of times in a single chapter. These characters have bad dialogue and extremely limited expressions. There's little nuance to glean from any given panel in any chapter. It is awkward. It is hamfisted. And this is not a new thing.
The writing is just...things happen, with absolutely no reason to expect them to happen. Takeda Super had been relentlessly chasing whatever idea he thinks is titillating that day. There is clearly no long term planning. Characterizations have been replaced entirely. The roles characters play in the story are instantly and unceremoniously changed. Others just seem to act inhumanly, nonsensically.
You want a shocking, smutty manga that actually pulls off everything it is trying to? Maybe check out
Sasha-chan. The characters are expressive, amusing, complex, and dynamic. They have growth. And certainly, it isn't all widely palatable--there are many people disgusted by the content, and that's understandable. But the author's effort stands miles above what is going on here. He cares about the characters; he's not just throwing them as sacrifices into one dumb thing after another.
Really the only reason I read this anymore is that it's interesting to see just how hot the dumpster fire burns. But I can tell you I would absolutely never pay for it. I would not want to reward this disdain for the audience.