User:Bejanablog

PENIS (from the Latin word meaning "tail", he said the same root with the phallus, which means the same) is the male genitalia. The penis is an external organ, because it is outside the body.

Penis in biology function is as a tool of metabolic waste liquid form (urination) and as a reproductive tool. Mammals own real penis. Reptiles do not have a real penis because only a small bulge and not visible from the outside, so called hemipenis (“half-penises"). Organ with similar functions from other Division members of the animal is sometimes called the penis is not technically even like penis in mammals.

Animal penis is usually proportional to body size, but there is great variation in size between species, both its length and diameter, however, usually form a tube. For example, an adult gorilla penis was erect reach 4 cm, while that of chimpanzee’s penis size smaller body has a length twice. Human penis is relatively large proportion than other primates.

Penis beetle Callosobruchus analysts have bulges like a brush. This structural function is to injure the female reproductive tissue to be receptive to sperm.

Source Healthy Sex