SOUTH Africa's blood donor service has banned blood from sexually active homosexual men due to a higher risk of HIV, it said overnight, provoking an angry response from gay activists. "A man who has had sex with another man within the last five years, whether oral or anal sex, with or without a condom ... is not permitted to donate blood and must please not do so," Sapa news agency quoted the head of the South African National Blood Service, Dr. Robert Crookes, as saying. South Africa has the world's highest number of HIV cases with more than 5 million...