Not in my experience, quite the opposite, in fact. Hot, keen to enjoy themselves, and eager to please - that's what I found. I think you've got to be there on business though (or, I suppose in reality, look as if you are). Conversation sometimes limited, since they don't always have all that much English (but enough to get by).
It seems that most asian women are more open to sexuality in general. Every asian girl i've been with has been a freak. I exclusivly date asian women for the most part. They are more loyal, caring, and sexual.