Probably a relief valve, more than anything else. There are almost no available women to these Chinese men, thanks to the one child policy.
Very naive. Chinese cannot just waltz out of China in the past two years. Anybody getting out is getting out with the CCP’s blessing. They will be tracked constantly and at the very least they will be coerced through threats to their family in China. At the worst they are sending spies, agents, couriers, and future saboteurs.