In over a decade of non-monogamous dating, I've run into the "I'm entitled to look at your body because, being poly, you must be indiscriminate about sharing said body." guy more times than I can count. They often send the unsolicited dick pic, in an attempt to create a quid pro quo environment. Trust me on this, if a woman hasn't asked, and hasn't met you, she has no desire to be confronted with your man-bits in a text or email. If she hasn't offered, she is similarly not inclined to send you racy pictures.
This isn't a difficult concept to absorb, so take it on board now. When you've been chatting a woman up, and they stop responding after you've asked for hawt pix for the third time, it isn't a mystery. They've decided you're a creeper. You've been disqualified based on your own behavior. It has nothing to do with women being "teases", or too chicken to follow through with in person meetings. It's you.