I don't know what's going through her head obviously but it's been my experience that sometimes fantasies need to stay just that. Her coming out and saying something like, "I was reading this erotic novel last night and there was this chapter about a servant woman being taken by three hung black men aboard this pirate ship that had me thinking I'd like to try that." may not be the smartest thing to admit to. If she's like me that just not something you want to share with your guy. The male (sexual) ego is easily bruised (certainly that what I've discovered). Add, I'm the type of girl who would never want my man to feel less about what he does to me sexually. I want him to feel he's #1 in my eyes. All a woman is doing who plays that sort of cruel game is hurting their guy's confidence and the relationship. I know I've said this before but you gotta make him feel like a king if you want to be treated like a queen.
Truth is sometimes exposing a fantasy like I've described isn't what a man wants to hear coming from his significant other. I know from being a member of this site that some men actually find that sort of thing a turn on but I've never met a man in my personal life who wanted to hear that sort of thing. If I do divulge a fantasy it always involves my boyfriend. If I have a fantasy that doesn't include him I keep it to myself as I don't want to hurt him. We've got a good thing going why blow it on some silly thought that's never going to happen anyway? He's king, the boss, the best, end of. The more I feed him those positive replies to my sexual fantasies the better our relationship, our sex, is. That's what I've learned.