Giant squid have an odd and not fully-understood method of mating. The males of the species have a large, muscular penis that acts like a hypodermic syringe.

The male and female squid mate face-to-face (or the squid equivalent of that). They grab each other and and the male starts stabbing the female in the arms with his penis. This places the sperm below the surface of the skin. Scientists are not currently sure what happens after that, but the female apparently takes the sperm out of her arms and uses it at a later date.