Really though I think it's actually pretty silly to say you're condoning rape and abuse if you watch porn, as long as you've done what you can to be sure that it's been produced by two genuinely consenting adults and uploaded by permission.
People who surf the net and watch porn generally don't do that though do they. They don't care enough to do that, half the time they don't even think about the women. It wouldn't cross their mind to wonder if she's consented unless it's particularly violent maybe.
So your main proposal is abstinence for all on the grounds of "Do you, or do you not understand that when you watch porn you, personally, may be watching a woman who has not consented to sex and is therefore being raped, even when it looks like she has consented?"
No, that wasn't a proposal for abstinence, placid, that was a direct question to you and I wonder if you'll answer it?
To mitigate this risk, what would you propose as a legitimate expression of consent?
As I've said, it's very easy not to watch. There is no risk of watching a woman being raped, if you don't watch it. If you think that you might as well watch it because lots of other people do, then that is your personal choice and you should own it.