Basicly this. After he explained I understood what he meant, and somewhat agree with him, basicly shy girls being insane in bed and etc. But slutty I basicly associated to those who aren't inhibited, like girls gone wild or something.
I actually like the theme of corruption, of a "saint girl" going corrupted, but in this case Alyssa imo is a very well written character imo. I sometimes tend to see those kind of scenes as way too cliché or too corny, but with her I really thought of her as extremely cute shy girl. And she isn't even my favorite girl in game, although I can say I don't have a particular girl I actually dislike in this game. I only feel "meh" about Riley (besides her sin of liking pineapple pizza), but still I don't think I actually dislike her. Her "debut" was a bit odd, but I guess tastes are for everyone. And who knows, maybe she'll continue to grow as a character, we'll see.
Sure the game story is cool, and makes the player engaged, but props to Jestur for the effort in the writting, in order to ensure that the female characters at least feel unique and have great personality.