These guys try it with everyone 
I was a bit rusty joining OD this year as technology has moved on. I exchanged WhatsApp details with someone whose main topic of communication was "whether or not we'll be attracted to each other ".
Then he sent one of him (normal ) and asked for more of me. Which I did (normal photos).
Then I got up the next morning and thought "this is creeping me out" so I made an excuse (we were meant to be meeting for coffee and I said I was too busy with work) .
I have good photos online btw which are clearly recent , so I assume that anyone asking for more was trying to build up to "let's take naked selfies of ourself" or was controlling and socially awkward.
He then kept sending me messages which I ignored and I'm glad I did as he seemed a pushy nightmare
Also I googled his phone number to get his details and that confirmed my doubts - claimed to have a good skilled profession requiring X qualification (which actually is allied to mine)
but actually was more of a "admin\sales role " which absolutely wasn't what his profile said. And a completely random part-time job moonlighting as a kids entertainer 
So he wasn't that intelligent and that was probably why he didn't seem to have much conversational stuff apart from "what do you look like"
It's tough as I want to keep a light touch and be friendly and not overly interrogate people (as a lot of people come across better in person so it's best just to get a quick meet in ) but also there's so many weirdos and it's quite hard not to get cynical 