Arm sex

Octopuses are thoroughly antisocial. Yet for some reason they have evolved to mate in the most intimate way possible. Male octopuses have a big problem: female octopuses. Each male wants to mate and pass on his genes to a new generation. The trouble is, the female is often larger and hungrier than he is, so there is a constant risk that, instead of mating, the female will strangle him and eat him. The males have a host of tricks to survive the mating process.
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How male octopuses avoid being eaten by hungry females

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Octopuses Mate With a Special “Sex Arm”

Several studies have shown that sex determination methods based on measurements of the skeleton are population specific. Metric traits of the long bones of the arm have been reported as reliable indicators of sex. This study was designed to determine whether the three long bones of the arm can be used for sex determination on a skeletal population from Greece. The material used consists of the arm bones of adult individuals males and 93 females coming from the Modern Human Skeletal Collection of the University of Athens. The age range is years for males and years for females.
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Sexual dimorphism of the arm bones in a modern greek population

I have to take my arm off. I first saw the Bebionic arm—a robotic prosthetic that functions through electrodes and muscles—on an amputee actress and activist whom I met for drinks after she'd expressed interest in an article I'd written. I was born missing my left hand and went 23 years without wearing a prosthetic, but three years ago when she walked through the bar door to meet me for drinks, my eye went straight to her prosthetic—an all-white futuristic robot hand.
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