Mantis Wives
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"Mantis Wives" is a 2012 weird fiction short story by Kij Johnson. It was first published in Clarkesworld.
Rather than a narrative, "Mantis Wives" is presented as various excerpts from a Kama Sutra-equivalent for a race of sapient praying mantises, where the females practice sexual cannibalism. Despite it no longer serving the purpose of supplying essential nutrition to the females for producing eggs, females and males still feel driven to kill and be killed in elaborate variations termed "arts".