“If you offer to let someone punch for you a $5, and then 4 people show up and beat the crap out of you, they can’t get off the hook for assault and battery because one punch at $5 was already agreed upon.”
Lousy analogy as you don’t let people beat the crap out of you for a living.
The key question here is would she have likely consented to the act or acts had the “price” been to her liking. I think we all know the answer to that question.
But she didn’t consent.
What part of that don’t you undersdtand?
She may have consented to the acts if the price was right. However, if after she arrived and told there would no money paid, and she said she changed her mind, it would still be rape.
The key question here is, did she consent. And the answer is "no."