Porn games are games where sex scenes are the number 1 focus, game where the story is the focus are erotic/adult games
In the beginning of the game she didn't even think about doing stuff with other guys, she only started thinking about and wanting to do that with Luke's insistence/influence, for example, when on the non ntr path she stops the alley scene herself saying she's not comfortable, but on the ntr path she's fine with being groped, so I'd say she is slowly getting more and more corrupted because of Luke.