It was disrespectful to discuss the love-child said to have been fathered by President Jacob Zuma with the daughter of soccer boss Irvin Khoza, ANC Youth League president Julius Malema said on Monday.
"We are Africans and sitting here all of us, Zuma is our father so we are not qualified to talk about that," he said at a briefing in Johannesburg after a meeting of the ANCYL national executive committee over the weekend.
Malema said the ANCYL would emphasise its HIV programme and "one boyfriend, one girlfriend" stance in an awareness action across the country.
He found it disrespectful to reply when asked whether Zuma was a good example to the youth.
There has been no official comment yet on the love-child claims, which were published in the Sunday Times.
"I'm not going to comment on that matter. All those enquiries must be answered by the presidency," said ANC spokesman Ishmael Mnisi.
The presidency, meanwhile, described the issue as "an entirely private personal matter".
The Democratic Alliance has accused Zuma of undermining efforts to eradicate HIV and Aids by having sex without a condom.
Zuma is registered as the father of the girl, who also bears his surname, and who was born to Sonono Khoza on October 8 - three months before he married for a fifth time. She is reportedly his 20th child.
The Khozas have also not commented on the matter. - Sapa