A bit like you then...
The lengths you've gone to just to be this shitty to the dev about a fictional character in a porn game.
Eh, someone having an opinion about the story in a game, a book or a movie is not "shitting on" a dev, a writer or a producer, it's called having an opinion. And while the opinion may not have been delivered as you, or the dev, hoped it would be that does not diminish the value of it. A LOT of guys don't want to date or get involved with a woman who was a slut or a whore (same diff, one gets paid outright the other not), so writing a story where one of the LI's has that history, or did that actively in the story should not be surprising to turn off people, especially if it comes as a surprise in the story, or some sudden character shift that wasn't prefaced otherwise.
Having a character or story "jump the shark" by adding stuff that has no real build up doesn't add drama, it just shows that the writer lacks the talent to otherwise integrate the change into the story in a way that makes it believable. It's like so many supposed fans of movies, books, anime, etc complain a story doesn't have enough depth unless a character dies. That's not a requirement to a story, it shows those viewers lack of understanding that a story can have a lot of heavy impact wihtout someone dying, but that depeneds greatly on the talent of the story teller.
Going back to the complaint about the character being a slut being a turn off, well some would find it believable, some not. A writer needs to keep in mind that yes, in life peoiple can do a 180 and completely change their former daily habits and outlook, but typically that requires a huge life altering event, not someone just waking up one day and 'deciding to change'. Can a woman go from shy to total slut? Yep. Can they have poor reasons for doing so? Yep. Usually based around poor self-esteem or sexual abuse by someone in their household. Sometimes they do it to "rebel".
Regardless, no story normally gets better by artificially injecting drama, whetrher that happened here or not is up to each player to decide. That doesn't mean someone's opinion is invalid, it's all opinion, even the writers, since it's based on their view and relation to the story they tell. if a writer doesn't want someone to hjave an opinion on their work they trhey should make sure it's never published or shown to someone else. Otherwise they can, and should, get a valid reaction, even if it's not one they expect or sometimes want.