I did have a couple of asian WLs who had orgasm with me in the past.
How did I know if it was fake or real? You can tell and feel it if you're experienced. Also, there is a clear difference in their expression when they really have orgasm and often it gets quite wet.
It requires some effort though, you need to treat them well and make them feel comfortable so that they can be relaxed. Foreplay is important as well, so you should not rush but try to gradually reach your climax at the same time while monitoring your partner's body language.
You will feel incredible climax if both you and your partner cum at the same time.