President Jacob Zuma should seek professional help for "his sex addiction", a South African MP says.
This follows reports that Mr Zuma, 67, who has three wives, has a "love-child" with Sonono Khoza, 39, the daughter of local world cup boss Irvin Khoza.
Kenneth Meshoe said Mr Zuma should get help, like "Tiger Woods did", and also accused him of contradicting his government's HIV/Aids policies.
The ANC has confirmed that Mr Zuma has paid compensation for the pregnancy.
In several South African cultures, the father of a child born out of wedlock pays damages known as Inhlawulo to the family of the baby's mother.
Mr Zuma's payment of this suggests he is not denying paternity.
It seems he is sending a message which says 'Don't do as I do, do as I say'
Patricia de Lille
Independent Democrats
He has often spoken of his pride in his Zulu culture.
African Christian Democratic Party (ACDP) leader Reverend Mesheo said the "love-child" was an indication that Mr Zuma "is not using condoms and is undermining the safe sex message of his own government", report the local Times and Sowetan newspapers.
There is an ongoing debate on Mr Zuma's practice of polygamy, with critics accusing him of sending mixed messages on HIV prevention.
South Africa has the highest number of HIV infections in the world - more than five million people.
http://news.bbc.co.uk/2/hi/africa/8491375.stm