On the contrary, she is someone who'd do that a hundred percent. It's hinted that she sucked her way to the top so much she developed chronic throat pain. She is very much not against using sex to get what she wants.
I just replayed the very beginning, and from the first moment, even before he met anyone, the mc is already resolute to changing his ways. Most of his actions this part of the game are predicated with him saying "I didn't do this before, let's change that." So I think the mc isn't quite the loser we thought, as even before meeting any of the changes to make things easier for him, he stll wanted to change. Would he have succeded if everything was the same? Maybe not, but his outlook changing was him and him alone.