When you are not giving free reign to your emotions or urges you can dream of being ‘dominated’ by a character in a sexual way. Sleep becomes the only ‘natural’ way that your consciousness can process this energy and there is really nothing sinister involved. Sometimes the threat of being raped can symbolize being forced into a situation that has 'raped' you of your values. If you are dreaming of being raped because of actual trauma of this type, consciousness may still be attempting to process these difficult memories. See Shadow and Archetypes and Characters.