Well from my experience lots will have changed by December. But I visit often so can update before your trip.
Gay bars
Toolbox - just reopened, has shirtless dancers, fun place
POC - great little bar, open late, dancers every night, drag queens fri and sat, great staff, very welcoming
Blue Chilli - recently moved, not tried the new venue, drag shows, big crowds
Heart of Darkness - drag shows, lots of gay guys there but it’s really touristy and not my favourite place but is open really late like 5am sometimes
Space Hair - really hot waiters, hands everywhere!
Hotels
There are 3 gay ones, and 2 are really well priced, the Birdcage and Pride resort. The Birdcage are fine with guests they just have to leave their id at reception if they are locals. There’s also Arthur and Paul’s, it’s really lovely but had a recent price increase.
Saunas and massage
I think LOVE is the only sauna that would be like a gay sauna in other countries, but I didn’t enjoy my experience there at all. The host or manager was super friendly but it was just not clean.
The other places are all massage places only but I found them all to be quite nice environments, not sleazy and fairly easy to find etc. Hather Khmer massage being the most fancy, always lots of guys to choose from if you want a massage and always clean. Then there’s ones called Man Massage World, Ahram massage, Chanak spa, Paradise massage, Ganesh. They all have telegram so perhaps get that before you come and you can make appointments or just show up and see who is there. Facebook is still very popular here so you can find the place on Facebook and it will almost always have there telegram channel linked