A place Zoo spa&onsen is on google maps in Sukhumvit near soi 77/1, but I passed there and didn't see it, neither in the location on google maps nor anywhere nearby on the same side of the road.

However, it seems a specific other offer (that may well please even latin a lot) is done by BT. See their presentation (probably dated by now) on gayguides/listings/massage-then after all the Brasil/Colomb places. Their own site/tweet only list daily which guys are supposed to work from that time-a very few from 13/opening, then later on gradually a few more. One is named CHIC.
A link would be helpful.