During college (35 years ago)--I put myself in some situations where either someone tried or did take advantage of me (unplanned sex). Whenever I had only drank moderately or had not been drinking at all, it was a lot easier to walk (or run) away from the situation. I also recall going to the bar in college with a friend (since I drove, I drank moderately) and seeing how some guys would look for drunk girls to hook up with when it was "last call".
I am very sorry that you have to deal with this memory. I know how troubling it can be.
Possible trigger:
However, right or wrong, in my experience, when you get drunk amongst guys, these troubling situations happen more frequently. In the article: What Is Rape? it says,
"Consent, or lack thereof, is one of the main elements of the crime of rape."
In my opinion, unless there are witnesses, this is harder to prove in court when you are drinking heavily. Witnesses only saw how much she drank. Yes, the article also says, "Further, sexual penetration with someone who is unconscious or asleep is virtually always deemed a rape, as there is no way for the individual to give their consent to the act." but this might also be hard to prove because she stayed with him (and there were even others around, she was not a hostage) for such an extended period of time. Whatever his intentions were--if a guy is accused of rape, it is a serious crime and most would claim that you consented (I have been in situations where I didn't know if I consented or not!). I am NOT trying to blame the victim only stating reality. I would think that reporting a crime that you can't easily prove might be traumatizing but a good compromise could be telling your gfs what happened so it doesn't happen to them. That said, she did NOT ask for this and did not do anything wrong.