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It is often said men think about sex every six seconds, and now research has shown some males really do have sex on the brain. A study of tiny, transparent worms found the males boast two extra brain cells that drive them to seek out sex. In fact, these cells have such a powerful pull, they can cause them to prioritise sex above food. Although the study was on worms, because their biology is similar to ours the researchers said the findings provide insight into the behaviour of the sexes of other animals, including humans.