Show 'em what your mom blessed you with.
But experts have countered that the rehab was ineffective anyway, and have urged the government to take new steps.
According to a 2004 government decree, those found paying for sex may be fined between VND500,000-VND5 million, depending on the circumstances.
Newcomers are often shocked by what they see but the regulars never miss an opportunity to appreciate the show.
But Nguyen Thi Tu Anh, director of the Hanoi-based NGO Center for Creative Initiatives in Health and Population, said it was right to shut down compulsory rehab centers because they were an ineffective deterrent.
He said there are more than 180,000 technically legitimate establishments, often hotels, restaurants and karaoke and massage parlors, which employ 60,000 female employees, 7,000 of which are suspected of being sex workers.