I have never been to Manaus but after a quick Google search, I found Clube H20. However, it seems to only operate 4(?) days a week.
https://www.instagram.com/clubeh2o/?hl=en
https://www.instagram.com/clubeh2o_/?hl=en
There is also a Pub Cine Aventura Manaus and a few gay bars in my search.