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.
Many mammalian species have developed keratinized penile spines along the glans and/or shaft, which may be involved in sexual selection. These spines.
Men have lost the DNA code that once made human penises spiny, according to a new analysis of the human genome. 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 of the organ.
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.
Penile spines are barb-like structures found in many mammals. Their role remains under debate, and they may play different roles in different.