Friend sleeping with boss to get up the career ladder?

I have a friend 22f who came to me crying that the boss46M forced her to sleep with him. ( I was like how can someone force you, coz she herself went out with him and agreed to stay in same hotel room). She was crying, saying she was raped. She was asking me to raise voice for her. I was like, you raise the voice, I will support. But she didn’t do anything about it. I asked her after sometime why she hasn’t raised voice, she was not very clear in her answer so I let it go. Edit : This happened 2 years ago.

Cut to today: In 2 years, she has recieved 4 promotions and incredible hike. Am I stupid to think where all this is coming from? She was an intern when she has joined, now a senior manager.

Do girls do this? I had left the company to focus on competitive exams so I am not in touch with her.

Edit: thanks everyone for the response. I was really naive to not think otherwise. I hope people who are forced to do this out of some need find a way to get out of this. One should not be forced into doing such things for money. If she is doing it by herself and complete will, its her choice.