Why do guys randomly ask for pictures or videos?

I started talking to this guy a couple days ago. He messaged me through Instagram he liked my pictures that I had on my story. A couple hours ago he asked me to send a picture or video. Not a nude one. But in my head I’m thinking about the worst reason he could be using it for.

Why do guys randomly ask for pictures or videos?
Why do guys randomly ask for pictures or videos?
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