Went again yesterday (Sunday) but learned a valuable lesson: Even if you're horny, don't bother going in the early afternoon!
I arrived about 12:45pm and didn't realize that the only areas open are the building that reception is in--the central courtyard and the entire other block are closed until 17:00. And anyway, that was fine since there were a TOTAL of about 20 people there until about 14:00, when it started to get busier (not busy, but at least more selection).
Played with a few guys, it was OK but nothing special. Should have brought my gym clothes and worked out! Had lunch, then left at 15:30.
Funny enough, as I was exiting met a Chinese guy from Shanghai (muscled, 30yo, professional)who said he was too scared to do much with the guys there, too shy--and so we went to my hotel and he didn't seem so scared there.