It's normal and common to be turned on by a woman's sexual history with others. There are even biological underpinnings why that is so. But showing someone the door in that state is ass-hat douche-baggery. Please remind yourself that some things really are a kink too far, if you find yourself admiring that aspect of it.
Sometimes people can feel better about things if they talk about them. It's a way to process our feelings. Or she might talk about it because she sees it turn you on. We all can do things for our partners even if we'd be happier not to
And even if there was an explicit agreement to this, it's also dragging others--without their consent--into the scene. People need to be careful with that.
You're welcome, friend. I really want to see everyone having a sex life that is safe, sane and consensual, and vibrant, and free, and ecstatic, and authentic, and honest, and healthy. All those things are getting harder to find, unfortunately.
If that doesn't seem like a big deal to anyone, consider this: Her appearance would be all too easy to see as a result of abuse or rape. Which could result in a call to 911. Which could mean the original parties are dragged into a very different nonconsensual scene.
That helps. Somewhat. But it still leaves concerns. Still, no one can go back and rewrite anything, and I'm reminded of both my sister and my sister-in-law, two women who didn't always employ sound logic in sex. Now you would never do that, right?
I dreamed about a 18-year-old niece, who flirted with me and showed her body off several times. I would not go there. Now she is late 50s and a couple of children not the same body. Those dreams are over. I missed that one.