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The blue whale has the world's largest penis of any living organism. It is commonly cited as having an average penis length of 8 feet (2.4 m) to 10 feet (3.0 m) and a girth of 12 inches (300 mm) to 14 inches (360 mm). An ejaculation load of a blue whale is estimated to be over 35 pints (19.88 litres), based on the size of its testes, 100–150 pounds (45–68 kg).
The reported average length varies but is usually mentioned to have an average penis length of 8 feet (2.4 m) to 10 feet (3.0 m). Roughly 8 feet (2.4 m) appears to be the most common reported average length and 12 inches (300 mm) to 14 inches (360 mm) in diameter, making it very long and thin in proportion. However, its girth has also been reported to be nearer 18 inches (46 cm), with a single ejaculation estimated to be more than 35 pints (19.88 litres), based on the size of its testes each weighing 100-150 lbs.
Another name given to the penis of a whale is a technical name, “The Corpus Christie” and in this case the erect length has been reported to be between 9 feet (2.7 m) and 12.5 feet (3.8 m). "Average" for a blue whale penis, however, is difficult to gauge given that it only comes out "during the intensely emotional time of mating, and there are few brave enough to saddle up next to one with tape measure in hand whilst the male is desperately trying to implant his dork into the vagina of his massive mate." The penis of the blue whale is normally hidden inside its body and jets out through a genital slit during sexual intercourse. They are stated to be tough and fibrous (more than in any other mammal). It is believed that it uses the elasticity of this tissue to get an erection and not from any blood flow, though not confirmed by any scientific doctoral study. In the book Moby Dick by Herman Melville, it is mentioned that the size of its dead outer skin could be spread to cover a floor length which would function as waterproof jacket while skinning the dead whale. The penises also have a bone which are used by Eskimos as runners for their sleds along with “baculi” (meaning “penis”) of other animals such as polar bear and walrus.
With whales, the length of the penis can be an indication of the maturity of the organism. Sei whales for instance are divided into categories such as immature, pubertal and mature. However, length is not the only factor, it is recorded in relation to the size of its testes and histology; for instance the longest penis of an immature categorized whale was 96 centimetres (38 in) and the smallest penis of a mature whale was 95 centimetres (37 in) of research conducted off South Africa. By comparison the average blue whale penis is nearly 3 times the size of that of a sei whale. Specimen measurements indicate that a blue whale measuring 21.6 metres (71 ft) in length had a non-functional mammary narrow passage of 40.6 centimetres (16.0 in) width and 48.2 centimetres (19.0 in) length, with the penis measurement of 1.83 metres (6.0 ft). Another specimen in which the length of the whale was 20 metres (66 ft) and weighing 50.9 tons, the brain weighed only 3.636 kilograms (8.02 lb).
"Blue whales have the largest penises on Earth. An erect blue whale penis is 12 inches (30 cm) in diameter and ten feet in length. It is fibroelastic like those of the blue whale's artiodactyl relatives. The retracted penis curves in an S-shaped loop and stays inside the body. When erect, it peaks out of the genital slit. Blue whales also have a distal spiral valve as a spermatic tube. Cetaceans do not have scrotums like terrestrial mammalian males do. Mammalian scrotums lower ambient temperature to keep sperm viable, so cetaceans had to find a way to compensate. And they did. Blood in veins that go through fins and the fluke loses heat. When that blood is sent directly to the testes, the sperm are cooled below body temperature and remain viable. The females have a long vulva with two nipples on each side to nourish newborns. They go in heat any time of the year, but the most common is during the migration to warmer waters for mating season."
-A University of Wisconsin extract on the the penis and sexual function of the blue whale.
The Icelandic Phallological Museum has a portion of a blue whale's penis measuring 170 cm (67 in) long and weighing 70 kilograms (150 lb), which Iceland Review has dubbed "a real Moby Dick". The specimen is only the front tip, as the entire organ, when intact, would have been about 5 m (16 ft) long and weighed about 350–450 kilograms (770–990 lb), well above average for even a blue whale. The penis of an adult elephant has the largest of any land animal at 6 feet (1.8 m) on average.