Spiders, being part rodent, reproduce by laying eggs. During mating season, a male spider impregnates a female spider by means of a microscopic copulatory organ - a "fang" - that introduces the male's web-like semen into the female's "mystery bag", which contains the unfertilized eggs. The eggs are then fertilized and the female later realizes that she has been violated and is pregnant, prompting her to eat her mate. The motives for such an inhumane act are still unclear, but according to new research, female spiders really think male spiders have no balls due to their reluctance to mount the final attack on humans, and express their frustration and anger by draining the males' juices.