Male shark's 'penis'.

post #413539

While called a 'penis' here, the shark's claspers are specially adapted fins which are used to anchor the male shark to a female shark during mating.
Unlike a penis, claspers are not necessarily a part of the insemination process, they do not have a urethra, they do not ejaculate.

See also:

• animal_genitalia
• anatomically_correct

• Wikipedia: Shark reproduction

Forum discussion:

• forum #197830 - Tag Implication: claspers -> multi_penis (Jun. 2016)