Fantasizing about rape...

Hey, I was just wondering if it's normal to fantasize about being raped by a big amazon-like woman with a penis? And actually enjoy and get off on it?

Is it normal in general to fantasize about getting raped? And wanting your boyfriend to act like he's raping you?

I've had these fantasies for a while now, since about freshmen year in high-school and was hoping that I wasn't the only one or something like that...