Penis
Penis or penis (penis) is generally used to represent the male and male and female animal organs, in the mating when the germ cells into the estrogen phase of the female genitalia. Many species, including vertebrates and invertebrates, have this organ, but not necessarily homologous. Such as mammals, are not similar to the majority of male insects or cranes (such as fleas). Some of the animal's reproductive mating organs do not use the name, such as the majority of the head of the mosaic of the mollusks (a tentacle), while the male spider with their fingers. In animals that contain placental mammals and the physiological structure of humans, the penis also contains the local outlet end of the urethra, which releases urine during urination and releases semen when mating is required. Human penis is an external organ of human males. ...