Practically speaking there's not much difference since there's a large amount of violent or extreme pornography which also teaches boys that directly or indirectly. It also teaches girls that it's "ok" cause they see it online.
There's many studies and organizations who publish warnings about violent pornography and young adults:
Dr Ruth Weir of City St George's, University of London, said extreme porn had been "normalised online" and was now "playing out in young people's relationships". [1]
Unless I'm missing somethiny, that article has no data that backs up Dr. Ruth Weir's claim.
It first posits that adult content has been normalized online, then cites unrelated statistics about abuse victims who had watched adult content. There's nothing that convincingly links that that first statement to the latter data.