I'm wondering if the "rape is about power" advocates feel uncomfortable saying rape is about sex because they feel that if they gave the latter any credence it would just ratchet up the slut-shaming and the "well, she shouldn't have been wearing that short skirt" talk from the other side.
But the point is the latter could be 100% true and it should not make one iota of difference to the wrongness of rape.
Let's say you're hungry and you forgot your wallet and won't be able to eat all day. You walk past someone eating a delicious looking hamburger. It doesn't matter if you're hungry. It doesn't matter how shamelessly someone has been wolfing down that delicious burger, in front of God and everybody. You've got no right to snatch it out of their hand and scoff it down.
I honestly think 'rape is about power' is a meme that makes it easy for people to dismiss rape activists as radicals preaching condescendingly to the hoi polloi from their tenured professorships ivory towers. It doesn't help that it just seems to be plain wrong, or at least totally unevidenced.
Anti-rape activists need to tackle the slut-shamers at their own game.
"Yes, she was wearing an outfit that would make a streetwalker blush. Yes, she was drinking hard and flirting shamelessly. And if you did not get consent to have sex with her, you raped her, and you are 100% culpable.