And they are very very different, I would dare to say more different than any other ethnic (can we say so?) group worldwide: you have ABCs (American born Chinese), their parents and certainly CBCs, Aussie BCs and so on. There are Singapore-Chinese and overseas Chinese in other Asian countries. Taiwan Chinese and Hong Kong Chinese. And then there is this huge mainland area with around 1.3 billion Chinese, where the living conditions differ so greatly that it's hard to imagine for anyone who hasn't been there.
All those people are Chinese, but the all have different backgrounds: capitalistic system or planned economy (though even the mainland is shifting very quickly towards capitalism, stronger than outsiders usually see), freedom of speech or getting killed for speaking out the truth, diversity or open hate from other societal groups (e.g. Indonesia) and so on and so on. And then there is the fact that people differ even within a society, with the result that you could very easily meet Chinese people from, say Beijing, who are very open sexual and have more sexual experience than, say, an American 30 year old who never had a girlfriend. Nevertheless it's a fact that most Chinese are not like that but instead having less sexual experience than their western counterparts (I'm not judging this, just stating the fact as the book says it and also as my own experience supports it).
Now, one could say (and 3 other readers did so) that this book is therefore useless. I strongly disagree. First of all the author states exactly this fact at the beginning and warns about generalisations (as every psychological book should do so). Second the information he gives is in around 95 % of the cases supported by my own experience (nationality: German; 8 months living in Hong Kong, studying Business and Chinese and working, travelling on the mainland to Shanghai/ Beijing/ Guangzhou/ Shenzhen, also having lived in the US for 6 months meeting quite a few ABCs,).
So use this guide as a background information but not as a "now I know everything about Chinese"- guidebook. Nobody will ever know everything about the Chinese, simply because there are no "Chinese" as such. But this is the general problem of all social sciences where there is no 1+1=2 like in maths. Knowing that, this book helps you a bit and gives you quite a few "I see!"s on your journey into the fascinating Chinese culture (which is indeed possible for a non-Chinese although the reader from San Francisco obviously doesn't think so). Therefore I rate the book 5 star because it delivers what it promises and this is how I define quality.