Why Do Guys Have Spines on Their Genitals? | RealClearScience - Penis barb
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Many mammalian species have developed keratinized penile spines along the glans and/or shaft, which may be involved in sexual selection. These spines. For all species of the cat family, mating is painful. It's not the biting that hurts the female, it's the male's penis, which is barbed with tiny.