What to do if I find out my sister is a slut?

Anonymous
So my little sister has always told my mom and i that she is a virgin has never kissed a guy etc. But tonight i found out that she made out with one of my friends little brothers and that everyone knows she's the town slut! it's kind of embarrassing because all my friends have been hiding it from me and they knew. every time someone sees me they think "wow she doesn't even know that her sister sleeps with a lot of guys". she's 16 and i do believe women should be able to have as much sex as they want without being judged but still it's embarrassing! I don't know what to do? i want her to leave my friends siblings alone but i can't just flat out tell her that, can i?
What to do if I find out my sister is a slut?
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