Female praying mantises frequently practice sexual cannibalism by biting off the heads of their male partners during or immediately after mating.

A closer look

Female praying mantises frequently practice sexual cannibalism by biting off the heads of their male partners during or immediately after mating. This terrifying romantic ritual actually serves a vital evolutionary purpose, as the decapitated male provides a massive, immediate injection of necessary protein that significantly increases the number of eggs the female will lay. The male's nervous system is also decentralized, meaning his headless body can completely finish the reproductive act while the female casually eats his brain like an appetizer. It really sets the bar for dating apps when you realize that in the insect world, a successful first date literally involves becoming the main course so your unborn children have a slight statistical advantage in the wild