Yeah you gotta be careful with girls who think they like it rough. Especially young ones. Everyone's idea of rough is different.
I met a 21 year old girl on a dating site who wanted to fuck me as soon as I sent her a cock pic. She had only been with one guy at that point and was ready to start slutting it up. Kept talking about how rough she wanted it and how she wanted dirty talk and how she wanted to try anal and this and that.
So after a few days we meet up at a hotel, and she showed up dressed super slutty. We start going at it right away and we're going at it and she was so wet I told her that was all the lube we'd need for her ass and she tells me to go for it. So I start fucking her ass, slow at first gauging her reaction and all and she seems into it so I just go to town.
Before long I'm slapping her ass and calling her a slut and a whore and telling her she's my fuck toy and she belongs to my cock etc etc. Well after I came I go into the bathroom to wash up (anal sex and all) and when I come back out she's fully dressed waiting to say goodbye.
Next day I see her online and she tells me how much she wasn't into any of it and when I started the name calling she stopped enjoying and just kept going with it so I could get off since she had told me she wanted to try it before hand.
Moral of the story is that being curious about something doesn't mean you'll definitely like it. I met her again and went more of the pleasing her and mutual enjoyment route and she turned out to be a lot of fun, she just wasn't into everything she thought she was.