I drinking at home one night, and one of my guy friends brought me the last one I had. He was not drinking, but he had been making all my drinks. After the last one I blacked out or passed out and came to undressed on my roommate's bed. The guy was there, talking to me like normal, explaining that they had had to put me in the tub because my vitals had crashed and that's why I was undressed, but after a few minutes I suddenly found I couldn't move or speak anymore. As soon as he knew I was unresponsive, he undressed and started repositioning me without another word. I could still blink and produce tears, and when I did that, he looked absolutely enraged and bit me so hard it broke the skin in a few places, presumably to make sure I was still immobilized. When I still didn't move, he relaxed, sort of smirked down at me, and then penetrated me.
The next day when I tried to ask him why the fact that I wasn't moving hadn't clued him that there was something seriously wrong, he again got angry and got in my face, saying that whether I remembered it or not, I had consented earlier, that he hadn't raped me and I better not try to say he had. I was so scared that I backed down and said I knew he wouldn't do that, that I just wasn't clear on what had happened and was trying to understand it from his point of view. I never reported it because I thought if he was right and I did consent, then it didn't matter what he put in that last glass (it was likely ketamine going by the effects it had), and I didn't want to make a false accusation. All I knew for certain was that I never said no, although I had consistently turned down his advances during the months before. This was in the mid-90s and the thinking was even more twisted then than it is now. I wasn't even sure I'd been drugged or what it was until the internet matured enough for me to research it years later.