China Press reported that several massage parlours in Singapore would pull down their shutters to give the impression they were closed for the day whenever they had customers patronising their sex services.
The daily reported yesterday that the centres, located at the People's Park Complex, would open and close countless times each day.
An observer who identified herself as Miss Lee said there were at least two masseusses in each centre.
"They are scantily clad and stand outside the centre to solicit customers," she said.
Miss Lee added that once a price had been agreed upon, the masseusse would pull down the shutter.
"After the service has been rendered, the masseusse will open the shutter again," she added.