But depending on the cultural norms, doing nothing yourself can be clear permission for another to do something.

"Speak now or forever hold your peace."

It depends on the cultural norms, no?

So the question is (1) Is it even possible to instill this as a cultural norm for intimacy, and (2) if it is possible, how do you actually do it?

Keep in mind that religions have been trying really really hard for millennia to get people to simplify their sexual behavior with only mediocre results (and at the cost of a lot of trauma and guilt). This isn't the same thing, of course, but the precedent is worrying.

People are complicated. If we find a problem that would become simple if people acted simply, and solve that simple problem, it's only a solution if you can get people to act in that simple way. Often you can't.

So--what's the evidence so far? People have been trying this approach for a while. Is it working? If no, what else could we try? If yes, how do we know that it's working via the mechanism we think, as opposed to "more attention on consent makes people be more careful even if they don't follow our advice on how to be more careful"?