It's just a scummy thing to do imo.
I think when it comes to sex or intimacy, it's the decision of the people in the relationship, no one else.
It was just full-body nudes, strip teases and stuff like that.
Of course, only the single friends at the time will be looking.
Look, it's reasonable to be uncomfortable with it, it's reasonable to discuss it, and it would be sensible to break up if it's a dealbreaker.
I do wonder about the original agreement.
If the financial aspect was an issue, then she should have discussed that with him originally instead of just straight up not sticking to her promise.
Of course she has been dishonest here, I am not refuting that.