I had heard from a farang with whom I shared a morning coffee that he had been "dragged" sic into an upstairs go-go erotic show one night recently, but from his description I was led to believe it was in the opposite Sunee soi. I looked for the bar he described and can only see U Turn as a new upstairs bar which fits his description. From the outside it appeared to have very little appeal or indication it was anything other than a bar where numerous shishas were being delivered.
I posted the above recently and can now confirm there is a new upstairs go-go bar/erotic show between Oud's and the currently closed Forest House.. It is in fact up-stairs. It has a small green neo signage saying Cocktail boys.
I didn't check it out as I was returning to my room with the boy du jour who wasn't keen to go upstairs with me to look, in spite of saying "up to you", I wasn't really in the mood for a go-go bar anyway, so at a later date maybe.