Girls, how do I stop my brother from wearing my panties?

Jasminecool
I am a teen girl (18 yrs) who is having a brother (19 yrs) wearing my panties instead of his boxers usually. I know that there will be a hygienic issue because of wearing my undies. And this is not safe also. I'm weird that why teen boys wear girls panties? Are they comfortable than boxers? Anyhow I want to stop him from wearing my panties. What should I do so?
Girls, how do I stop my brother from wearing my panties?
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