What is sex really for?

Few topics arouse as much interest and controversy as sex. This is hardly surprising. The biological continuance of the species hinges on it—if human beings stopped having sex, there would soon be no more human beings. ...

Study explains evolution phenomenon that puzzled Darwin

Why do some animals have extravagant, showy ornaments—think elk and deer antlers, peacock feathers and horns on dung beetles—that can be a liability to survival? Charles Darwin couldn't figure it out, but now a Northwestern ...

Oh deer: monkey caught in flagrante delict-doe

Scientists on Tuesday revealed the "highly unusual" behaviour of a male monkey filmed trying to have sex with female deer in Japan—a rare case of inter-species nookie.

Male chemistry primes females for reproduction—but at a cost

A research team led by a Northwestern University scientist has discovered that male animals, through their invisible chemical "essence," prime female animals for reproduction but with the unfortunate side effect of also hastening ...

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