Again, if you have been raped in real life, rape dreams will have a completely different meaning for you and you should seek help.
If you've not been the victim of rape, it's still quite common to have rape dreams.
Back in college, I had a reoccurring dream about this character called the Dragonfly Man. He morphed from this guy I was dating into his big beast who had glowing eyes and wings. The he would wrap in up in a bloody saran wrap cocoon and try to rape me. It was really horrifying. Being as that I had never been raped, I had to look further into these dreams to find out what was going on.
Rape is about violation, about being forced upon, about your well-being and self-esteem being threatened. Although I never actually got "raped" by the Dragonfly Man, these dreams were an unguent call to action that this guy would destroy my self-esteem. That he would seriously violate my self-worth if I kept seeing him.