At a conference in 2000, Watson suggested a link between skin color and sex drive, hypothesizing that dark-skinned people have stronger libidos. His lecture argued that extracts of melanin – which gives skin its color – had been found to boost subjects' sex drive. "That's why you have Latin lovers," he said, according to people who attended the lecture. "You've never heard of an English lover. Only an English Patient." He has also said that stereotypes associated with racial and ethnic groups have a genetic basis: Jews being intelligent, Chinese being intelligent but not creative because of selection for conformity.