I'll put some cards on the table re: sessions and paying for sex. I've never done either but I have two anecdotes related to the topic, one personal and one secondhand.
When I was in my early 20s I was living in southern New Hampshire and saw that a model who was relatively local to me, Xujtta, was offering sessions with BigCutie Bonnie who was visiting from England. I found Xujtta pretty gross (she looks like she smells like piss, can't explain it) but was a big fan of Bonnie's and figured I'd look into it because I was that deadly combination of bored and horny. I corresponded with Jen/Xujtta who was extremely professional and courteous. She laid out all the ground rules - I'd pay 300 an hour and supply all the food if I wanted to feed them, there would be no cameras unless I signed some forms, squashing, belly play and worship were all on the table but there would be zero sexual contact and my clothes would stay on, but I was free to use her bathroom if I needed to finish at any time. I booked a two hour session with them, Jen even CC'd Bonnie who emailed saying she was So ExCiTeD (nice touch, admittedly) but I ended up cancelling because I decided spending upwards of 750+ dollars to get sat on by two fat women, one of whom I didn't even like, wasn't worth it for my broke ass. But that's a little glimpse into what session booking is like, at least. Would be interested to hear stories from dudes who have actually gone through with it!
Now, on the other hand... before I was into fat women, I came up in the breast expansion/big tits fetish community - do we have any BEArchive users here? I spent a lot of time on that forum in my teens and early twenties and still peruse it every so often. Maybe some of you know Chelsea Charms, the model and exotic dancer who had the world's biggest breast implants and toured the country performing in strip joints and doing private dances and sessions for most of the 2000s right up until the pandemic. BEArchive guys will tell you Chelsea had pretty strict rules for private dances but, yes, play your cards right and you might get something extra. I remember one guy claiming she was "full service" when he booked her. Chelsea has since retired and gotten her implants removed but did a series of Q&A videos where she alludes to having seen celebrities, athletes, and politicians for private dances, which to me implies she retired with enough money to live comfortably - basically, what I'm trying to say is, if someone of her fame and status was available for full service, I wouldn't rule it out that it happens in this community too. But of course I am just speculating.