The male sex drive is to blame for most of the world's conflicts from football hooliganism to religious disputes and, even, world wars, according to scientists. The "male warrior" instinct means that men are programmed to be aggressive towards anyone they view as an outsider, a study said.

In evolutionary terms, an instinct for violence against others helped early men improve their status and gain more access to mates, but in modern terms this can translate into large-scale wars. In contrast, women are naturally equipped with a "tend and befriend" attitude that means they seek to resolve conflicts peacefully in order to protect their children, researchers said. The study, published in a journal, Philosophical Transactions of the Royal Society B, is a review of the evolutionary evidence for the so-called "male warrior hypothesis"

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