Speaking from experience, I understand where Kavanaugh is coming from as I and my friends also drank heavily as teenagers. But I don't recall anyone getting so drunk that they passed out, although I felt the need to repair to the back seat of my car after one party, where I instantly fell asleep. However I can still recall the events of that party to this day.
The drinking age for beer in my state was 18 at the time, 21 for liquor. As we mostly drank beer kids would get puking sick but not pass out. It was only on those occasions that someone brought hard liquor that some would get 'crazy' drunk, but were in no condition to sexually assault anyone. Interestingly the few girls that partied with us, usually girlfriends, rarely got drunk, and usually left our parties early.