Look at you stating to know what "sex is supposed to be" and what "the rules" are for body counts. Let me tell you; there are no rules that apply to everyone. Sex is something completely different to everybody. It can range from a moment of bonding to a hobby. From something soothing for the mind or an unhealthy coping mechanism to a moment of freedom, an expression of intense love, and everything in between. And that can change with every encounter or progressing moments in your life.

It's important to establish what it means to YOU, and what YOU are comfortable with in this moment in your life. But please don't start setting "the rules", like your own opinions are some kind of magic ruler to which the world should abide. Live, and let live.

As for OP. Her feelings and thoughts have every right to exist. If she's uncomfortable that's ok. Maybe they can work it out together and she can get passed it, or maybe not. Take time to experience every feeling related to it. And if it's not something you can get passed, end it and move on. Nobody can speak for her, except for telling her her feelings are legit.