Is it normal to have dreams about being raped?

Ok, so I've had dreams before about getting raped. I've done some research and have come across various reasons like being insecure or your mind telling you that someone is violating you, but this doesn't seem to fit right. Maybe a couple of them have been because of that, but I think the underlying reason might be a secret sexual fantasy about being raped. I don't mean I actually want it to happen in real life because that's horrible, but I mean, a desire of being dominated or forced to have sex against my will sort of thing. I've had dreams about getting raped and then woken up in the midst of an orgasm, I don't know, I guess this makes me feel a little wierd, I'm not into masochism or anything but I'd like to know if maybe others have experienced this and can help me feel not so wierd haha. thanks