Have you ever sent unsolicited nude pics, or received same, to or from people you are NOT in any sort of relationship or sexual connection with?

It's a 'no' to both of those for me. I would never send unsolicited nudes that were not appropriate to the context, and have never received same.

I didn't even do it with (sending or receiving nudes) people I was in a relationship or sexual connection with, which was now almost 10 years ago.