Felines, especially domestic cats, are well known for having penile spines. Upon withdrawal of a cat's penis, the spines rake the walls of the female's vagina, which may serve as a trigger for ovulation. ... In galagos, penile spines may form a "genital lock" during copulation.
Their penis is barbed honey that's why a female cat is always loud when they do it. In our first house, those mfs are always loud, always banging in our roof making it into their motel.
