Jewkes and her colleagues interviewed a representative sample of 1,738 men in South Africa's Eastern Cape and KwaZulu-Natal provinces.

Of those surveyed, 28% said they had raped a woman or girl, and 3% said they had raped a man or boy. Almost half who said they had carried out a rape admitted they had done so more than once, with 73% saying they had carried out their first assault before the age of 20.

The study, which had British funding, also found that men who are physically violent towards women are twice as likely to be HIV-positive. They are also more likely to pay for sex and to not use condoms.

Any woman raped by a man over the age of 25 has a one in four chance of her attacker be...

Jewkes and her colleagues interviewed a representative sample of 1,738 men in South Africa's Eastern Cape and KwaZulu-Natal provinces.

Of those surveyed, 28% said they had raped a woman or girl, and 3% said they had raped a man or boy. Almost half who said they had carried out a rape admitted they had done so more than once, with 73% saying they had carried out their first assault before the age of 20.

The study, which had British funding, also found that men who are physically violent towards women are twice as likely to be HIV-positive. They are also more likely to pay for sex and to not use condoms.

Any woman raped by a man over the age of 25 has a one in four chance of her attacker being HIV-positive.

One in 10 men said they had been forced to have sex with another man. Many find it difficult to report such attacks to the police in subcultures where the concept of homosexuality is taboo.