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Tl;Dr - we don't really know but like always it's because of a gene called sonic hedgehog aka shh

"Cartilaginous fishes, like sharks and rays, are blessed with something called "claspers," dual sperm-releasing tubes jutting from their pelvic fins.*"

"Many animals, including humans, have a gene called*Sonic hedgehog*(Shh)-named by discoverers who were clearly twisted Sega fans. The gene promotes cell growth that leads to the development of an organism's body. Now researchers at the University of Florida have confirmed that prolonged exposure to*Shh*causes the growth of penis-like appendages in cartilaginous fish, after completing an experiment focusing on skate embryos."
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