<human>: Can you give me the gist of the text in a nutshell?

My girlfriend is constantly coming over with bruises, on her arms, legs and face. I've had people ask what's up with that. Well, she does martial arts (Judo and Gojuryu Karate, apologies if that was the wrong spelling) for years along with her brother. They frequently meet up and spar together though they live apart.

She has a couple other sparring partners but she's usually with her brother. Anytime they spar she'll come home with at least one to three bruises, naturally as her boyfriend I have a problem with this. I don't like the idea of my girlfriend being hit or bruised even if it's 'just martial arts sparring'. It's pissing me off.

I've explained that I'd like her to take it easy, maybe not spar as much or anything but she still continues with it. Maybe ask her brother to not hit as hard but nope? She's still being bruised up.

I'll admit this, she gives as good as she gets apparently as he sustains some nasty hits as well but still, I don't like it and don't know what to do.

My girlfriend just says she's done this since she was a child and her brother and her have always sparred roughly. I feel like she's just ignoring everything that I've said and how I feel about this.

The other day she had a bruised cheek and a buddy of mine cracked a joke that I was hitting her (shitty joke, yes) and another piped up nah, she could kick my ass. It's true, that last bit but at the same time these bruises are seen by others and also I don't want anyone jumping to conclusions I'm hitting her or something fucked up like that.
<bot>: girlfriend is constantly sparring with her brother and getting badly bruised, I hate it but she doesn't feel like it's an issue