Pretoria, 19 June-(ANA)-One in four South African men questioned in a survey said they had raped someone, and nearly half of them admitted more than one attack.
The study, by the country's Medical Research Council, also found three out of four who admitted rape had attacked for the first time during their teens.
It said practices such as gang rape were common because they were considered a form of male bonding.
The MRC spoke to 1,738 men in KwaZulu-Natal and Eastern Cape provinces.
The research was conducted in both rural and urban areas and included all racial groups.
Using an electronic device to keep the results anonymous, the study found that 73% of respondents said they had carried out their first assault before the age of 20.
Almost half who said they had carried out a rape admitted they had done so more than once.
One in 20 men surveyed said they had raped a woman or girl in the last year.
The study also found that one in 10 men said they had been raped by other men.
Some 3% of the men interviewed said they had coerced a man or a boy into sex.
The participants were also tested for HIV and the authors of the survey were surprised that men who had raped were not more likely to test positive for the virus.
Mbuyiselo Botha, from the South African Men's Forum, which campaigns for women's rights, said that any view of women as "fair game" had to be challenged.
Mr Botha, a father of two girls himself, said: "I think that yes, the figures are that high and for us, for me in particular, that is a very sad state of affairs.
"It means that we continue in South Africa to be one of the highest capitals of rape in the world.
"I don't think it's cultural per se; I think it has to do with how a lot of us men worldwide were raised. The issues of dominance against women, issues of inequality, are pervasive and you find them throughout the world."
South Africa's government has been repeatedly criticised for failing to address the country's rape epidemic.
A recent trade union report said a child was being raped in South Africa every three minutes with the vast majority of those cases going unreported. (ANA)
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