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All bars are priced a little differently but a barfine is generally around 3000 pesos and the girls expect an additional 3000 tip on top.
Compare that to nearby Angeles City where barfines are 2000-3000 and the tips given are usually no more than 500, so half the price.
If you have never been to an Asian girly bar before that link breaks down what they are like.
A cliffs notes version is a bunch of sexy ladies in bikinis stand or dance on stage.
There is no sex inside a girly bar, it all goes down back in your hotel or apartment.