Have you read the opening titles of this game? They go like this:
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The author makes no bones about it being a game for those who love slut runs, starting from strong, confident and gorgeous to end up grooling over vulgar, disgusting multiple cocks.
'Pure' is just a pretence, something to grow out of.
Now tell me about these rewards for 'low' sluts (which is not synonymous with 'pure'). Are there as many non-sexual passives as there are sexual? Are there as many safe for work GCs as there are not safe for work GCs? Is this a game you'd have no problem playing in front of minors? The purest version of Karryn is wearing a very revealing uniform, something out of a strip club rather than any real-life correctional facility.
Let's admit it, it's a hardcore porn game, that's what it is. Not a life sim with optional sex scenes, not strip poker or chess with boobs, not a FPP shooter where you happen upon a BDSM dungeon in mission 5 (which is easily avoidable), not an explore-expand-exploit-exterminate strategy where instead of tanks and infantrymen you can choose to build and command cum launchers and futanks, just for shits and giggles. Just a porn game exploiting the taming of the shrew trope.
Sluts and their fans are at home in porn.