Rape fantasies aren't actually about rape. They are usually an indicator of a desire to be dominated or experience power exchange during sex. It's probably one of the most, if not the most common sexual fantasy there is for women. After all, you're essentially wanting someone to take control over you sexually. There is a great emphasis on the idea of lust, physical attraction and urgent physical need. If someone is "raping" you, that means they want to engage with you so much they don't "care" about anything else, which is where the idea of and the "attraction" to "rape" (i.e. dominance) comes in.