He is exactly paying to abuse her. She does not want the sex, she wants/needs the money.
She wants to have sex for financial gain, that's her choice and as such is not abuse on his part.
He cannot buy consent for sex. Re-read Beach's quite excellent post on consent. The only way a woman consents for sex is wanting sex.
I completely disagree with Beach's post and there's not much point in going around in circles on that score. All I will add is that under that definition, wives get raped every day by husbands who love them to bits. That can't be right.
Out of interest, why did you say you were an active member of punting sites?
I answered that one?
So are you a punter or not? Have you ever paid for sex?
I am not a punter, I have not paid for sex in the terms outlined here (cash or money) but I have, many years ago, been in a situation where sex was exchanged for something else. I can't say anymore than that because it's a private matter. What I will say is I didn't feel a sense of power or control which is often attributed to these things instead, I felt weak and sorry for myself. I'm still not sure why.
And to be clear fully no one was hurt or abused physically or emotionally apart from my own reaction which I just mentioned. Ok ?