It will be the poorest Chinese who go without mates. They are the most violent and the most dangerous, and no country is capable or willing to support the immigration of literally millions of childless and aggressive poor men.
The Chinese leadership really only have two potentially effective options in my view. Try to manage it through pacification campaigns (estrogen in the water?) or send them abroad to die in wars.
The UK begs to differ.
20% of Angola's population is Chinese.
Also note that there are countries (although without such a Chinese influence) who will have major demographic shortages. A good example is Botswana which has an HIV/AIDS prevalence rate of 38%.
Do you have a citation of a source that says this? I just tried the usual kind of online sources for national population statistics for Angola, but I haven't found confirmation of this interesting statement.
http://en.wikipedia.org/wiki/Demographics_of_Angola#Ethnic_g...
https://www.cia.gov/library/publications/the-world-factbook/...
Just note that the citations from the CIA world factbook is probably worthless. In the official demographics of South Africa for example, neither illegal immigration or temporary migration is noted.
This is fairly high though (as much as 3 million Zimbabweans and many people form other African countries such as Somalia).
I see posts claiming a 100,000 works in the formal sector (i.e. working for formal companies). The number of Chinese working in the informal sector or illegally would be unknown.
But the 20% figure is most probably wrong.