What happened to reading? Look, again: I get it. You're not plugged into the culture at all, so you think this is coming out of nowhere. But don't call me a moron because of your own ignorance, it makes you look bad. The entire point of the article is that Galko chan was "Defying stereotypes" in the first place. What did you think the stereotypes were?
Let me give you
more reading, and directly quote the bit explaining the history of this (Since you're bad at reading):
Crucially,
it doesn't matter if the stereotype is accurate. The fact that it's a stereotype means that it can be used as a shortcut for character exposition. The moment you see it in a story, the stereotype becomes 100% true in the context of the story, and from there the author can play with the tropes surrounding them as they see fit; the author has gone ahead and told you she's into fashion, she's a slut, she probably likes to party, doesn't respect authority, etc. all with a single word. Some of them play it straight, like here, others can subvert our expectations, like Galko, while yet others can add in a small twist, like Bisque Doll.
But you, lacking cultural context, never really understood these stories, and apparently just assumed that the characters involved were actually supposed to be likeable, respectable members of the community
when that's a subversion.
Having her be a virgin would be a subversion, and it would have come up MUCH earlier.
With stereotypes. Keep up.