Ungud

In Australian Aboriginal mythology, Ungud is a snake god who is sometimes male and sometimes female. He is associated with rainbows and the fertility and erections of the tribe's shamans.
See more at Wikipedia.org...

[Aboriginal] In the mythology of the Aboriginals in north-western Australia, Ungud is a hermaphrodite snake god, who is sometimes clearly male and at other times clearly female. Ungud is often associated with the rainbow and the erections of the medicine men.