I was in Ubon about two months ago and loved the atmosphere there.
I went to Famous Bar which is a coyotee bar with both male and female customers. Useless to go there before 11 pm, but some absolute stunners work here, you could pick one if you are lucky. Located behind the old bus station in the Regent Palace Hotel area, Chayangkun Rd.
There is also a new karaoke with boys, most of them very nice next-door guys. "Black Beans" karaoke almost next door to Krung Thong Hotel in downtown Ubon.
For massage places, you have the Relaxing Sauna (which I did not vist) 163/1 Soi Phromrat 1, which is rather difficult to find from what I read. I also saw an ad about a new place : Erawan Thai Massage & spa - behind wat Dorn Klang 789/11 soi 2 Tambon Kham Yai Amphoe Muang Ubon tél 080-1693187
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Phuchai