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Animal Sex: How Sloths Do ItRather than mundane, lazy sex, sloths participate in quite the mating game. In fact, sloth sex involves high-pitched screams, promiscuity and eye-gouging battles.
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Big Butts Can Lie: Bootylicious Baboons May Not Be Most FertileThe swollen red bottom of a female balloon may not be the signal of sexual fitness that researchers thought it was.
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Animal Sex: How Barnacles Do It -
Sex in the Wild: 6 Ways Animals Do ItValentine's Day may inspire people to buy chocolates for their loved ones or treat their sweetheart to a romantic, candlelit dinner, but animals have entirely different courtship behaviors.
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Animal Sex: How Octopuses Do ItOctopus mating involves shifting body colors, detachable "penises," long-distance mating and sexual cannibalism.
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Animal Sex: How Anglerfish Do ItAnglerfish mating involves biting, tissue fusion and the complete lack of mate choice by females.
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Animal Sex: How Dung Beetles Do ItDung beetle sex involves short breeding periods, intense competition and, of course, poo.
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How Sex Organs Get Their StartNew research shows how external genitals arose from very different starting places for reptiles and mammals.
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Animal Sex: How Porcupines Do It
