Are there people that play a game like this and actually stick to the 'stay as pure as driven snow' path?
Yes. Sometimes. This MC seems sweet, the music has a nice vibe, and even the name is called good girl phone so I thought it would be nice to play that role. That or my more preferred walking of the dangerous tight rope between being a little human while not falling into outright debauchery.
But oddly, the good girl path seems almost ignored. I'd think even a total whore would get pissed off at having their privacy violated the way Chris does in chapter 3 but besides a few unkind words, it's life as usual. Hell, in her next interactions she can even say that she's into him like these points and earlier choices don't even matter. The game almost feels kinetic with a tally for the end game but not much player agency in between.
A lot of the people around her are terrible influences too. This is less about subtly slipping into a "freer" lifestyle (also fun since you don't feel like you're playing a whore so much as a person making less than perfect decisions) so much as being dragged hand and foot. To be fair, with the exception of Chris, the story did take a more subtle in the third chapter. Even the professor, who also came off as incredibly creepy (odd that no one else in that world thinks so) came back as a little more reserved in this chapter.
Anyway, nothing against those that want to play as the whore. Sometimes I go down that path right off too. But this game is written like it doesn't want you to make that choice even though it's in the description as a viable option.