There was this little bar in Saigon where all the waitresses were also prostitutes; when the guy from Canada figured that out he exclaimed "Oh gosh!" and then pounded three Tiger beers in twenty minutes which I thought was hilarious. The girls ranged from middle aged and washed up (with a sliver of tragedy) to young and playful. I would go there to get drunk and chat with the girls; I never really considered paying any of them for sex. They were just friendly, attractive girls who were way more fun than the stick in the mud variety of girl who lack the healthy cynicism and trampled life experience that give people a special depth of character. Also, the masses of backpackers (one of the lowest forms of life in my opinion) never went in there, probably because it wasn't in Lonely Planet although one night this goth looking European kid came in with his head buried in a travel guide, sat around looking uncomfortable for about five minutes nursing a drink, didn't say a word to anyone, then bounced out of there into oblivion. So I learned, as an added bonus, that Vietnamese prostitute bars are an excellent tourist-repellant.
One night me and this French guy ended up in a karaoke bar with four of the girls singing Vietnamese pop songs until four in the morning. There is no way I would have had that kind of experience (it was a lot of fun) by checking wikitravel. I split a cab home with one of the girls and tried to get her to come up to my room. She offered a more attractive rate but still wanted me to pay so I didn't bite. Another night a British guy came into the bar with his girlfriend, who used to work there as a prostitute. Now she lived with him. I found it interesting that his father was dying of cancer back in England and yet here he was in a Saigon girlie bar with his prostitute girlfriend. His girl, who was probably a 5 out of a possible 10, didn't seem too interested in him but hey, that was her meal ticket. She'd leave him the second he stopped carrying her financially, but for the moment everyone seemed reasonably satisfied with the arrangement. He was your typical middle aged balding expat.
The fact that these chicks had lots of sexual partners is irrelevant to me. It's way more important to Western cultures that women maintain a fiction of purity than it is in the steamy depraved jungle of a godless tropical country.
I miss Vietnam.