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.

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By Mazull - 22:53
Penile spines, which are still present in several modern animals, are usually small barbs of keratin—a type of hard tissue—that line the outside.
By Sajas - 04:57
But there's a sinister side to this obsession, by which of course I mean penis spines. Throughout the Order Primates, as well as in many other.
By Shakam - 01:47
Every physical characteristic your cat has contributes to survival. The barbs on a male cat's penis are no exception. They help ensure that his genes are passed.

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