 In a related survey conducted among 1,500 schoolchildren, a quarter of all the boys interviewed said that "jackrolling", a term for gang rape, was fun.More than 67,000 cases of rape and sexual assaults against children were reported in 2000 in South Africa, compared to 37,500 in 1998.Child welfare groups believe that the number of unreported incidents could be up to 10 times that number.