Flatworm Mating Sounds Painful
When two flatworms meet, it’s not exactly romantic. They’ll extend sharp two-headed male genitalia to try and stab the other one to inject them with sperm. And even if they lose, it’s not the end of the world. The male will continue “fencing” until they’re eventually stabbed and impregnated If the female doesn’t want the sperm of the male, she can easily remove it. The females are resistant, while the males are persistent in their pursuit of mating (National Geographic).