Sharks have 2 dicks?? Technically, male sharks don't have penises. What they do have are grooved organs that are used to deposit sperm into the genital duct of receptive female sharks. These organs, called 'claspers', are developed along the inner margin of each pelvic fin

(the paired fins located behind a shark's belly). Because the pelvic fins are paired, so are the claspers. That's really all there is to it.
Curiously, although male sharks have two claspers, they only use one at a time.

Unfortunately, mating behavior has been observed in only a few species of sharks, but already some basic features of courtship and copulation are clear. When not in use, both claspers lie flat against the undersurface of the body

. After communicating its amorous intentions to a sexually receptive female shark through ritualized swimming and gentle 'love nips' along her back or flanks, the male grasps one of her pectoral fins