2006-08-05 07:55:14 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
There are two types of penis in the standard mammal world- fibroelastic and hemodynamic. Fibroelastic are very long, thin, and retract completely into a sheath when not in use. Bulls and boars have this type, which does not engorge with blood or swell significantly. They also have a bone in the penis.
Humans have a hemodynamic, which do not completely retract but still may be protected by a sheath (a dog is a good example). These are the type that engorge with blood, and swell considerably. With these mammals, you can clearly see the penis even in its non-working state, protected ot not. Horses, rodents, and primates all have this type of penis.
2006-08-05 14:21:46 · answer #1 · answered by Hauntedfox 5 · 1⤊ 0⤋
Human penises can retract too. Some men are born with their penis retracted and it's not until puberty that their penis and testes descends.
2006-08-05 12:41:41 · answer #2 · answered by Stephanie S 6 · 0⤊ 0⤋
Retractable Penis
2016-10-31 09:07:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋
go swimming in cold water and then ask that question ...
2006-08-05 08:51:53 · answer #4 · answered by atheistforthebirthofjesus 6 · 0⤊ 1⤋