Rape is indeed a serious problem in South African society. However, I couldn't fine the source of the Chinese "news" claiming that one out of four South African males admitted they were involved in raping before. The following is the closest news I could find:
[media]http://news.yahoo.com/south-africans-called-action-raped-teenager-145204663.html[/media]
" The chime sounds every four minutes on the radio station, reminding listeners that statistically yet another child or woman in South Africa is being raped (This converts to an astounding 128,160 cases every year! ).
...
The chimes on Talk Radio 702 are part of a campaign urging South Africans to identify perpetrators of rape that has become endemic. One in four females is raped here according to several studies, from months-old babies to 94-year-old grandmothers."