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I think there are two possibilities here, maybe a bit of an oversimplification, but in order to keep from writing a 10 page essay, this is what I think
1. She is a woman, she wants you to take the initiative and be the forceful one, so she talks about all these things related to sex in the hope that you will start
2. The more likely answer, unfortunately, is that she is just bored and likes messing with you and talking about sex to see your response and get attention