Why do guys take my stuff?

Lately, I've noticed a lot of guys steal things from me at school - binders, pens, my cell phone, etc. It's just ANNOYING and I'm sort of wondering where they're going with this. It's not like they're all friends or anything and I know they're not doing it to hurt me. They're just joking around but it was only funny the first time. It's hard to believe ALL of them like me but I know two of them do because they asked me out.

Oh, and I always get my stuff back. They're not thieves. :)
Why do guys take my stuff?
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