Hmm, maybe this is carrying submissive behaviour a bit far though.
Gallery - At it like rabbits: Bizarre animal sex in pictures - Image 4 - New Scientist
the male bites into the female's skin and doesn't let go. Their tissues fuse, their blood vessels join and the male slowly atrophies, first losing his digestive organs, then his brain, heart and eyes until he is nothing more than a pair of gonads.
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