A female leopard lashing out at her partner! A male leopard has barbs (tiny spikes) on their penises, this comes in handy to stimulate the female to ovulate, but these barbs make retracting the penis painful for the female which causes her to lash out at the male. At the same time snarling and biting by males is also typical during mating.

While looking into above, I found below:

Scientists believe men once had small spines on their genitalia such as those found in chimpanzees, cats and mice.

Analysis of the genomes of humans, chimpanzees and macaques indicates that a DNA sequence thought to play a role in the production of these spines have been deleted in humans, but has been preserved in other primates.

Deleted by evolution, added back by @durex

Full Read: How man ‘lost his penile spines’ by BBC Neil Bowdler.