They don't have to sell their bodies to make a decent living. They sell their bodies so they can enjoy a luxurious existence with minimal effort. The Chinese are particularly susceptible because of their materialistic lifestyle and lack of morals.
I agree. Go to any major cities in western countries with a large Chinese (commonly referred to as Asians) population and there's also a vibrant commercial sex industry. Where there's a high demand for prostitutes from Asian men, there will always be a large supply of Asian prostitutes supplied by the triads.
Unfortunately cities like San Francisco, Vancouver, Sydney and Melbourne are more like Asian cities instead of Western cities.