Why does my sister hangout with a lot of guys?

Danielle Y.

So my sister and I are close like we do everything together like making food and makeup etc

Lately while we hangout in her room she’ll invite some guy over and ask me to leave she closes the door and plays music loud for like an hour and it’s happened a lot lately and i don’t know why or what she does!

I don’t talk to many people and never had a date

I’m 16F