Girl 1:
Met from CL. Instant connection. We saw each other fairly consistently for about 8 months, always P4P, always the same amount. As we got to know each other better, we talked about more personal stuff (as is always the case), and I saw an opportunity. As it turns out, every dollar that I had given her since the beginning of our "relationship" she put directly into the bank. She didn't spend it, didn't really need it, but felt it was necessary in order to keep "distance" from a married guy. She was more in it for the sex than anything else, but also had an insecurity about money because she didn't make that much in her day job.
As it turns out, she had a bunch of cc debt that was consolidated at 1.9% or something to that effect, but she didn't "like" having the debt, and for some reason didn't want to take the money that I gaver her and apply it to the debt. She had set up a separate bank account for the money that I gave her, and felt that was "untouchable" money for some reason that I was never able to understand. So once I sensed that it was her CC payments that were causing her some angst, even though she could have easily paid them off from her savings, I offered to stop giving her cash and take over paying down her credit cards so she didn't have to make the payments, thereby easing her monthly nut (no pun intended). She thought about it for a couple of days and agreed.
It made all of the difference in her attitude about money, and we never spoke of it again. Ultimately, I ended up getting a "deal" to some extent, because I paid her "less" on average than I was paying her before, but at the same time she was happier, because in her mind she was debt free.
The result? We hung out a lot more. More dinners, more "non-sexual" meetings, and probably the same amount of sex, but the quality of the sex became more "real" over time.
It was still a P4P relationship, but with the transactional aspect taken off the table, it really didn't feel like that for either of it. It became real, and in some ways a little too real. But since the relationship ended (I ended it about 15 months ago for "personal" reasons), we have remained friends and see each other occasionally, and it is like we never even had the "arrangement" in the first place.