My new roommate is infatuated with ism?

At first I didn't think much of it. I thought the whole thing is probably new to her and is therefore interesting. But she's taken it a little too far to the point where it annoying. She keeps asking weird questions like why some s are vegans, what kind of women s like, would gay women find her attractive and dumb things like that, which you can never give a definitive answer to. If my girl and I are snuggling together on the couch or something she just sits there and watches like it's a freak show. My girl thinks she's weird too. Other than the whole fascination with s thing though she's alright. She's a nice girl, has her life in order, has friends, dates and things. I don't wanna be a ***** to her, but how can i politely let her know that she needs to get used to this? I am so NOT looking for a new roommate. This is gonna screw up my rent situation.