Bill Clinton made a plea yesterday for a new emphasis on monogamy as a key element in the battle against Aids. The former US president, not noted for his ability to keep his own marriage vows, said it was very important to change people's attitudes to sex. In an interview with the BBC recorded in Africa, Mr Clinton said that increasing support for monogamy was not just a problem for the continent worst hit by Aids but for the world. "To pretend we can ever get hold of this without dealing with that – the idea of unprotected sexual relations...