Why do girls want to cuddle in public?

Yesterday me and my girlfriend were at lunch at school and she started cuddling with me everyone started to look at us (which I don't really care that they were looking but after a little while it got kinda creepy) and she didn't stop until lunch was over. Does she do this to tell everyone that I'm hers or just to annoy me?
Why do girls want to cuddle in public?
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