A bit of background: I've had a bit of an odd social life - in high school, I had my group of friends, but we weren't very popular (or at least I wasn't). I recently started university, and I started to open up, and this brought a bunch of new opportunities, including my first case of friends with benefits. We started hanging out right when second semester started in January, and we've been seeing each other like twice a week since then. We'll call her Sarah from now on.

&amp;#x200B;

Both Sarah and I don't want a relationship, but recently she's been asking me more about how I'd feel if she slept with other people. At first, I was accepting of it, but over time, I've realized I can't really deal with it, and I expressed my concerns and asked why we couldn't keep it exclusive for the time being. This was met with a somewhat angry reaction from her, and thus leading to us having a small falling out. I'm mostly worried about both my safety and hers, as if she has multiple partners, that would put me at the same risk as her for contracting an STD. Also, I feel like if she sees other people, I will be seen as unnecessary, thus making me lose a friend as well. She doesn't seem to understand this, and thinks I'm being selfish about it. She thinks that I'm being a restraint for her sexual ventures.

&amp;#x200B;

Despite this, I still want to be her friend, but the idea of her sleeping with other people stings right now and I don't know how I should handle it. Reddit, AITA for not feeling comfortable with this?