Long-term relationships are fundamentally dishonest. And it's all the fault of females. Scientists claim that monogamous relationships among many species, including humans, only persist because females have found a way to disguise whether they are fertile. The researchers claim that by offering sex anytime, but no clues as to whether they will conceive, females trick males into hanging round for a long time. The evolution of this deception is the only reason that monogamy has developed.
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