Stephanie Pulford warns us of the evolutionary dead end that is sexual cannibalism.

At least once a year, Cosmo’s cover story is about how to have better, longer sex: a turgid treatise on positions and anatomy.  Our finest ladies’ mags are ignoring the obvious. To improve the mating of our species, we must learn from the mistakes of garden spiders and band together to end sexual cannibalism once and for all.