Any woman who has ever ventured into the world of online dating, or almost any form of modern electronic communication, will tell you that one of their main complaints is that men routinely send them unsolicited pictures of their genitals.
So, again, we have evidence that men are sending such pictures because they think others will like them, as much as they do.
People who are offended and grossed out at such images would like them banned.
They want men to understand that such behaviors are rude, unacceptable and should simply stop.
The shaming and suppression of female sexuality is part of the issue here, as men don't feel they understand what women actually want sexually, and women don't feel they can express it safely.
Unfortunately, I don't think such dialogue is happening, or even possible right now.