I think it's the proverbial, "doing a line off a Hooker's ass" fantasy that exists in pop culture. At this point party drugs are scary enough-- Heck, taking it away from sex workers, I know gay men who liked to party, but straight up won't touch party drugs anymore, and won't hang out with guys that are doing party drugs-- Who the hell needs an OD?
Taking it back to sex workers. Leolist is skeevy enough. Yes, there's that potential of getting dosed and robbed, but how comfortable are you having a dealer in close proximity? What are the odds of that sex worker being a desperate addict? (Yes, there are addicts in every walk of life, and in all segments of the sex industry. It's the desperate part that is risky for clients on multiple levels.) Or meeting someone strung out? Or whacked out of their skull? Likely surrounded by other people in similar condition. That also doesn't bode well for a quality environment, or a person who is taking care of themselves.
My advice would be to stay away from people advertising party favours, even if you're already in that lifestyle. If this is something you must do, only do it with party favours you procured yourself (from your own dealer), and I'd suggest doing it with someone who is open to 'party', but who isn't also dealing.
None of this is for me, and I like my boring life just fine. You do you, but try to be reasonably safe.