Why do girls cross their arms a lot?

JSmuve
I've noticed this more and more lately, but whenever I see girls sitting down or standing around, a lot of them have their arms folded in front of them. I know that crossing your arms in front is a sign of either insecurity/uncertainty/discomfort with the situation or disapproval, but this doesn't really fit a lot of the situations I've observed.

Is there something else that might cause this behavior, perhaps maybe it's an instinctual behavior? Or maybe it's just as simple as insecurity/uncertainty/lack of comfort in a situation.

Thoughts? Can any girls give me some insight on this?
Why do girls cross their arms a lot?
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