There's also the fact that each and every Chinese woman (AMP worker or not) is an individual, and they are free to draw their own boundaries irrespective of what the next gal is or isn't doing. While cultural influences tend to make certain behaviors prevalent or absent, there's a huge difference between "most" and "all." When you do the math, it's unlikely that any man has sampled enough of the HUNDREDS OF MILLIONS of Chinese women to draw a statistically sound conclusion.
I knew a Chinese girl, hot little 20 year old spinner, back in the college days (think Nixon administration)... she dropped her pants for me so fast, I forgot I was a skinny nerd! I know another Chinese girl, 27 years old today, who laments that all guys want to get into her pants; nobody wants to wait until marriage. A third of a century later, with China's opening to Western influences and with first-hand life in USA, these two women's sexual conduct couldn't be more different.
Bottom line: YMMV in all aspects of this hobby.