Escalate somewhere less obvious than in bed. (like a couch or so)
and "it's ok."
Killer line.
Deliver and turn the temperature down a notch.
So she has to turn it back up, because, believe it or not, most of the time it's just the woman wanting to prove to herself that she's not a "slut".
She "doesn't want to sleep with any man" because that "makes her a slut".
What she needs to trust is that you won't kiss and tell, and that won't judge her for being openly sexual.
When it comes to sex, it happens.
She most likely wants to be able to say "it just happened" as though she didn't see it coming a mile away.
So go easy, up the BT, and let her be clearly wanting it.
It may help to escalate gradually to make it "less obvious" that sex is the goal, and not go straight for the sweet spot.
Anyway, Reassure her that it's ok, and keep going.
Don't judge her for it, and if it gets really bad, you freeze her.
Believe me, if she's turned way on, and suddenly everything disappears, in an instant. (don't gradually turn down the heat, but go from steaming to freezing, you get it ?)
She'll most times feel so uncomfortable that she will try to go back to how it just was, imagine her shock, at you just pulling completely away at the least resistance.
From there on, you continue, escalate, amp the sexual state and fuck her brains out.
(you can of course caveman it, not saying a word, just going for it, and freeze if necessary, which builds a lot of tension she'll want to release, and you've made it clear that the only way out is for her to escalate more sexually)
Hope you find some help here
Cheers.