Tiresias:

Tiresias was a man that was transformed into a woman after hitting two mating snakes with his staff. After experiencing love as a woman for seven years, he once again hit two mating snakes with his staff and was changed back to a man. Jove and Juno were arguing about whether men or women experienced more pleasure during sex and called upon Tiresias to answer because he was the only one that had experienced it both ways. Tiresias sided with Jove and said that women experienced more pleasure. This made Juno angry so she made Tiresias blind, but to help make up for it, Jove gave Tiresias the power of prophecy.