Cape Town's mayor has called the South Africa National Aids Council and Sex World Education Advocacy Group "nuts" for suggesting that South African condoms should be branded with footballs during the 2010 World Cup.
Sanac and Sweat are working for prostitutes' welfare and feel that the step may be useful in raising AIDS awareness during the tournament.
They have also been insisting on the decriminalisation of prostitution.
However, Mayor Dan Plato pointed out it would only promote flesh trade.
"I'm not in favour of legalising prostitution; I'm very worried about young girls who prostitute themselves standing in the streets," the BBC News quoted him as telling South Africa's Pretoria News paper.
He added: "I think they (Sanac and Sweat) are nuts thinking they can somehow promote prostitution through the World Cup."
South Africa has 5.2million HIV infected people.
It is estimated 450,000 tourists visit the country for the World Cup starting in June next year.