The locals refer to the prostitutes in Vietnam as butterflies of the night.They operate around certain places and streets in Ho Chi Minh City.Reportedly, the prostitutes in Hanoi are seen parading themselves from early morning till midnight, every single day.It has been estimated that around 40 to 50 sex workers work a single stretch of the street, every day.
Although prostitution is banned in Vietnam, it has not been eliminated completely.
You have to be choosy is such situations since there remains a risk of you being robbed by fraudsters.
There are hot tocs, massage parlors, and even clubs with few freelancers (who charge more than the bar girls while looking a lot less hot). As mentioned already, the street girls offering sexual services would mostly come up to you asking whether you would like to have paid sex.
As a more conservative culture, the Vietnamese have less of a prostitution.
Keep in mind Ho Chi Minh City is not a sex tourism destination, Thailand is a best choice for sex tourism.