You come across a lot of the old fellas in Ayala in Cebu who live and thrive on the sex scene, its obviously prevailant. You'll also find the Filipina girls in bars in Hong Kong, Singapore etc.
A good book to read, which is about a completely different culture, but the essentials are the same is 'Private Dancer', its free to download/read online http://www.conanstevens.com/temp/private_dancer.pdf
Well worth a read.