Jacob Zuma is proud of his Zulu culture
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.
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.
Correspondents say the latest reports have dealt a fresh blow to Mr Zuma, who has been praised for his "openness" in addressing the HIV problem.
Opposition parties sang his praises last year when he announced major changes to the Aids policy in December, which include increasing the roll-out of ARV treatment.
But now they say his behaviour contradicts the government's stance on HIV prevention - for example preaching regular condom use and faithfulness.
"President Zuma's behaviour directly contradicts the government's campaign against multiple sexual partners, and the inherent Aids risk in having unprotected sex," said Democratic Alliance leader Helen Zille.
Independent Democrats leader Patricia de Lille accused Mr Zuma of not taking his own advice.
"He is the one who is always preaching responsible sexual behaviour, but it seems he is sending a message which says 'Don't do as I do, do as I say'," she said.
Mr Zuma is said to be the father of a girl born on 8 October 2009 - three months before he married Thobeka Madiba-Zuma, 36, his third wife.
MRS JACOB ZUMA
Thobeka Madiba-Zuma - married, January 2010 (above)
Nompumelelo Ntuli - married, January 2008
Sizakele Khumalo - married, 1973
Home Affairs Minister Nkosazana Dlamini-Zuma - divorced, 1998
Kate Mantsho Zuma - died, 2000
The ANC has refused to give details saying it is a "private matter".
"In terms of the African custom of Inhlawulo, it appears as if this has been sorted out. It is important that we respect this custom and that the privacy of the two families should be respected," ANC spokesman Brian Sokutu said, reports the local Times newspaper.
Mr Zuma has 19 children with his three wives and from previous relationships but it is not clear whether this figure includes the latest baby.
Ms Khoza works for a bank. Her father is a friend of Mr Zuma and, as chairman of the World Cup Organising Committee, is one of the most powerful men in South African football.
Mr Khoza, who is six years younger than the president, is said to be unhappy about Mr Zuma's relationship with his daughter.
The ANC also criticised opposition parties for their "opportunistic" behaviour.
"It is disrespectful to get political mileage out of a private, personal issue which has been sorted out... It is opportunistic of political parties to make noise of this," said Mr Sokutu.
This is not the first time that the president's sexual life has been under the spotlight.
In 2006, while being acquitted of rape, Mr Zuma admitted that he had made a mistake by having unprotected sex with a woman he knew to be HIV-positive. She was also the daughter of a family friend.
Mr Zuma has been married five times in all and is also engaged to be married to another woman.