>There has never been consistency at a population level when it comes to how men and women receive advances from the other.
True, but there are norms and averages.
>What, exactly, are women supposed to explain to men? And why is it their job? (Honest question as I'm having difficulty seeing how this is supposed to work on an interpersonal level and no woman can speak for all women.)
I explained this in my original comment. Women should have a reasonably standard way of behaving when they are sexually attracted and a perceivably different way of behaving when they are just feeling friendly. And they ought to explain to men what the two sorts of behavior are, so men can spot the difference. I don't see why that is unreasonable.