We are being warned to stop being so rough because our basketball league is 'co-ed'? WTF is that normal?

We have a basketball intramural league at our college, and a lot of us take it pretty seriously. However there are a handful of girls playing and they are physically outmatched. A few of them got injured and complained, now all the males are being told to stop being 'so rough'.

Is this normal? How do co-ed leagues function if people don't play hard?
We are being warned to stop being so rough because our basketball league is 'co-ed'? WTF is that normal?
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