Generally, yes, rape is more about the feeling of power than about sexual gratification.
Victims of rape handle it all different ways. There's no one textbook definition for how a victim should react; some people consider it a trigger and avoid any and all mentions of forced sex, or even consensual sex, while others find it easier to cope in ways some people would look at strangely... and by that, I mean they'll often indulge in rape fantasies in one way or another. How it affects people is a spectrum, though there's no doubt it has a lot of damaging effects no matter who has to go through it, or whether they understand it's rape at all.
Rape fetishes are much different than wanting to be raped, though. It might have to do with the idea of being controlled/submissive, but it doesn't mean they want to get assaulted because they might write stories about rape in their spare time and get off to them.
Getting aroused even during an unwanted assault doesn't mean the woman (yes, men get raped too, but it's almost always women, so let's use that for now) is actively enjoying it, either. It actually serves as more of a defense mechanism, because it helps prepare her body (by lubricating, for example) and reduces the chance she'll get injured in the process due to being too dry.
As for Radiohead... thanks for being a rape apologist and demonstrating to this thread how NOT to react. :\ It shouldn't be the woman's responsibility to avoid rape or enjoy it if/when it happens, it should be the man's responsibility to not do it in the first place.
The main difference between consensual sex and rape is the woman's willingness to go through with it. And I don't mean "well she says no but she secretly wants it"; a woman can say no to her boyfriend even though a part of her wants it, but the rest doesn't feel ready, and if the boyfriend doesn't listen and keeps going despite her lack of consent? It's rape, full stop. It doesn't just happen to lone women walking through dark alleyways at night, after all. It can happen to women at the hands of people they know and supposedly trust, who take advantage of them whether they realize it or not.
As for the topic of this discussion... it's a difficult call. I'm inclined to say no, though, because the very thing that separates consensual sex from forced sex is... well, consent. Even if she secretly wants it to begin with, the moment she says no and starts to try and stop it, it becomes rape as long as the guy continues, and I guarantee you even if she thinks she's enjoying it (maybe in an effort to keep her mind from shutting down in the process), it will mess her up in one way or another.