Concepts like 'real Chinese girls don't like casual relationship' are a little like 'China is the only country with 5000 years of history', 'China is the only country never to have attacked another country', 'Chinese invented soccer, and golf, and the Olympics!'. Chinese repeat this stuff ad nauseum. Even some foreigners start believing it. Despite this it is of course pure crap.
All for rum, and rum for all!