Why do girls like to poke guys in the waist?

YourGuyBuddy
There is this girl that sits beside me in math class and I think she is cute. We talk, and every once in awhile she tends to poke me in my waist, I don't get annoyed by it, I think I like it so I just lol, and poke her back and play along... So why do girls like to do this?
Why do girls like to poke guys in the waist?
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