Is it normal for my girlfriend to not be curious?

I have been dating a girl for nearly 3 months now. We are very open with each other, both sexually and otherwise. We have had quite different backgrounds when it comes to sex, with me coming from a rural area where discussion and exposure to such things is fairly common, and I have never been embarassed about it. Also, being rather curious myself, about this and other things alike, I have done a decent amount of "internet research" on the topic too. She comes from a top city school (still public) where exposure to such things is less common (although still present). Her up bringing is also fairly conservative (not politically, just values). We have rather differed knowledge bases when it comes to sex.

When we are intimate, she enguages, and seems to, and tells me that, she enjoys it. The problem is, I feel that I am always the one to move forward, try new things, keep it interesting, etc. I ask her lots of questions, about what she likes, how she works, what her intentions are, but I never get anything of the type back. I have spoken with her about this, and she simply says that its not for lack of interst, she just doesnt know what to ask. She seems to lack curiousity when it comes to sex. She seems content to stick with what we do (3rd base or there abouts, FYI, but I'm not asking for her to go further than she wants to). She also seems to have this feeling that its wierd for her to want to know these things, and when I ask why she feels that way she says she doesn't know, its just wierd...

Is it normal for her to not have any desire to know more about me or my sexuality? Or how I tick or feel or what gets me going? And is it normal for me to want to spark that curiosity? How could I go about it?

Additional information: I am white Australian and she is Chinese Australian (that is, Chinese parents. but born and raised in Australia). We are both 19 and nearing the completion of our first year of our degrees.