There are a handful of massage parlours that are all accustomed to offering the usual extras same as Bangkok (full service mostly), a little karaoke bar area with rooms in the back (very cheap, full service), and I had a fair bit of luck with Thaifriendly there. I think Tinder could be okay too (not sure about P4P, but certainly dating, GFs).
There is actually a couple of soapy places (the rooms have a big bathtub with bubbles), but pricey in my opinion.
If you monger long enough in Ubon you find some gems that come and go, especially in the massage parlours and karaoke bars.
PM me for specific details. Or just ask here.
That said I noticed a lot of places disappear with covid. Hopefully just temporary