Girls, why would a girl *ask* for a dick pic?

I've been texting with a girl for a few weeks now. We met during the semester and recently we've just started flirting heavily recently. The other day when we were late-night texting (she may have been drunk), she said she wanted to see *all* of me and basically dared me to send her a dick pic. I blew it off because I'm not 100% comfortable with this. Did she ask because she wants me, or is she just having fun?
Girls, why would a girl *ask* for a dick pic?
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