Should I drop my friend?

So I have this friend, and we both read yaoi, and I have this uncle that's gay and he has a boyfriend. The problem here is that my friend fantasizes about my uncle and his bf having sex together. It really disturbs me, cause sometimes she'll tell me detailed stories about her fantasies. I don't want to hear about this type of stuff nor think about it. I've tried telling her to stop but she just doesn't listen. I've thought about dropping her and just leaving her but we've been friends since we were eight so I'm not sure if i should. I wanted someone else's opinion on this, so I went here. Though it might not be much help since this IS an illegal manga reading website with 90% of the the stories being yaoi. But it still doesn't hurt to try.