Sex with my ex. What now?

So my ex and I dated for a little over a year with the last 3-4 weeks being almost hell for me. We go to the same college, have a lot of the same friends, and saw each other on a consistent basis for 9-10 months with nothing happening. Then we somewhat randomly had sex after a party. A while after that she starts calling/texting me to come over on certain nights for pretty bogus reasons. Each time I've gone over we have ended up having sex, which is maybe 4-5 more times.

I obviously don't mind the sex, but why is she suddenly asking me to come bang her? I am in no way looking to get back in a relationship with her. Is she trying to with me? Should I ask her or just let it run its course until she says something?

Sex with my ex. What now?
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