Sea Slugs Are Hermaphroditic
Sea slugs are hermaphroditic, meaning they have both male and female sex organs. When these two come together to mate, they stab each other between the eye to deliver sperm. Scientists are unsure why slugs choose this spot for fertilization, but for some reason, it makes sense for them. Biologist Rolanda Lange said the fluid might “increase the fecundity of a sea slug’s sperm, or inhibit that deposited by previous partners.” They believe it has to do something with the central nervous system (National Geographic).