A female version of Viagra, the drug that transformed the sex lives of millions of men, could soon be developed. It was previously thought that the little blue pill, which has been widely used by men all over the world since 1998, would do little, if taken by women, to improve their enjoyment of sex. But latest tests have suggested that more than half the women given Viagra reported heightened satisfaction during sex. The discovery has given fresh momentum to plans for the commercial production of a female version of the drug - nicknamed "pink Viagra" - which could help...