There has been a drastic increase in the number of extramarital affairs over a decade in China.
According to the city's government-financed support centre that targets rising mental health problems in Shenzhen, about one-fifth of its cases are about extramarital affairs.
Kang Le Yuan psychological consultancy, one of the city's largest organizations for marital relations, showed that about 80 percent cases handled last year were about extramarital affairs.
The dramatic increase in such affairs has sent the business of private detectives booming.
A decade ago, detective Zheng Fan used to handle one or two extramarital affairs every month but now he receives at least six calls and five e-mails every day.
The number of such companies has also increased to more than 200 from less than 10 a before, reports the China Daily.
Fan said that majority of the men with a "second wife" have good educational backgrounds, considerable incomes and have been living in the city for a couple of years.
Businessmen, public servants, and banking and IT workers have been topping the list.
Moreover, the attitude of people towards extramarital affairs have changed.
"Men used to hide their lovers, but now their relations are open Even the security guards know who has a 'second wife'," he said.
Meanwhile, more of the lovers believe it is not wrong to be with a man who claims he no longer loves his wife, he added.
Zheng said that men with 'second wife' feel spiritually empty while becoming successful and rich and intended to re-experience the passion of love.