Is it normal that my rape dreams are sometimes arousing?

I always have really detailed but surreal dreams. This one night I had a vivid dream I was being raped by a guy I didn't know, but I liked it. I was trying to push him off but with no effort, and eventually I give up and kind of go with it. Rape is one of my biggest fears, but when I woke up I felt really, well, i don't know.. kinky? I have a boyfriend, we've been together for a year and a half, and the sex is good, nothing unusual, so I'm not quite sure where these dreams are coming from. I've had about another 6 dreams about me being raped since the first, and I'm starting to feel creeped out by myself. I've had dreams of being raped in a street, by my house, in a park, and even in my own bed. Is that normal?