Tiresias

Tiresias was a Theban prophet who lived an extraordinarily long life spanning seven generations. He struck two mating serpents with his staff and was transformed into a woman for seven years. When he encountered the serpents again and struck them, he became male once more.

Zeus and Hera later asked Tiresias to settle a dispute: which sex experiences greater pleasure? Tiresias, uniquely qualified to answer, said women enjoyed it nine times more than men. Hera, furious that her secret was revealed, struck him blind. Zeus compensated him with the gift of prophecy.

Tiresias appeared in many great myths: he warned Oedipus of the truth of his parentage, advised Creon in the matter of Antigone, and was consulted by Odysseus even after death.