What are we?

Girl, my main plate right now, have been asking me What are we?. We've been having sex for a month and a half or so, but from time to time she ask, and waits for my decision about this particular topic. As TRP instructed guy I know this looks and smelss like Shit Test, maybe. It's good to some degree that whenever she asks I dont answer her directly and this doesnt stop us having sex. Maybe it is good to she waits for my decision and doesnt push it (further), maybe. But I feel question should be answered some way or other. Also, this question seems to come when we don't talk for a while (lastly we haven't been talking much) or something doesnt go perfect.

Anyway, without being bitter and angry about this, could you please tell how should answer. I've kept my frame always, but I know being direct is the best thing, As Mark Manson teaches.