I'll add that I had a great time in Singapore and HK.
Singapore has their little parlors for fun, quickies. 4-6 girls that you can pick from. Then there's Orchid Tower. Think a mall that's a few stories with clubs and little parlors you can hit. Then the street part by there is really fun to just people watch if you like. Singapore is expensive but the girls not so much. Well under what you'd pay here. Ton of fun IMHO and again, the girls aren't that expensive. Maybe a bit more than Thailand or PI, but still a good value. Oh and the food there is really cheap and so damn good.
I know the issue with China and HK and its not the best for a long term visit, but the few apartments you can hit are a blast. Like 10-12 floors with 8 or so rooms on each floor. Sign outside it says how much, you knock on the door, she opens, and you either go in or say no thanks. I loved the experience. No issues not being Asian. $30-40 per. Again, limited but if you can do a day layover, I'd recommend it. Look up HK Fuji 161. Not just Chinese but from all over Asia and even saw two Brazilian chicks.
Singapore I'd spend a few days at and HK maybe a day or two. They're not on the scale of Thailand or PI, but still fun, not expensive, and no issues not being Asian/speaking the language