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Often considered the smartest invertebrates (animals without backbones) on the planet, octopuses can use tools, unscrew jar lids and tightly control their body color to match their surroundings.

They use this sharp intelligence especially in situations of survival — including when they are trying to avoid getting eaten by their hungry mates.

William Masters and Virginia Johnson became famous for the groundbreaking sex research they conducted at Washington University in St.

Louis in the 1950s and 1960s—so famous, in fact, that Showtime decided to turn their story into a new drama series, Masters and Johnson’s discoveries changed the way we think about sex and about women’s sexuality in particular.

A dangerous game Mating for males is a dangerous game due to the female's penchant for cannibalism.

To avoid getting eaten, they'll often mate from a distance or after mounting the back of a female's mantle — positions that give them extra time to escape should their (usually larger) mate turn violent.

Joseph Bennington-Castro is a Hawaii-based contributing writer for Live Science and

He holds a master's degree in science journalism from New York University, and a bachelor's degree in physics from the University of Hawaii.

If another male comes by, he pushes and grapples with his competition, a fight that may end in a fatality.Unlike females, "males have a modified third right arm called a hectocotylus, which has a sperm groove down it and a specialized tip," Mather said.To mate, a male will insert his hectocotylus into the female's mantle cavity and deposit spermatophores (sperm packets).To identify their sex, male keep a black- and white-stripe pattern on their bodies while in the presence of a female and during aggressive encounters, and females remain camouflaged.Some "sneaker" males use these telltale signals to their advantage by matching their body color to the female's — this allows them to creep past a guarding male and mate with the female secretively.

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