I really honestly don't understand how this ever got to be a thing and would give a lot to anyone who could invent a time machine so that we could go back and nip this practice in the bud.
I once had a guy I was fucking sending me a picture of him with a button down shirt on and no pants. He was not hard at the time of the photo. It was then that I determined that the only thing worse than a dick pic of a hard cock was one of a flaccid one. I don't know how many women have to say this, and how many times, but please just stop, unless the other person has agreed that yes, that is something they would like to have sent to them.