Sex at arm’s length? Male octopuses use specialised arm to mate, scientists find

Sensory organ in male cephalopod, known as hectocotylus, able to detect female hormone progesterone, even if male cannot see partner

Sex might seem an intimate act, but scientists have shed fresh light on how octopuses manage it at arm’s length.

Male octopuses use a specialised arm called the hectocotylus to place a package of sperm inside the female’s reproductive system.

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