What is the exposition of The Story of Medusa and Athena?

Medusa was a very beautiful mortal many mortal men wanted her and Gods. One night she was walking and Poseidon(in disguised) chases Medusa. Medusa runs into Athena's temple looking for sanctuary,but Poseidon had his way and abused Medusa.Athena(being a virgin Goddess) looked @ it as Medusa should have been able to protect herself and her virginity turned her into a Gorgon so that no man would ever want her again and would turn man to stone when looked into her eyes.(snake body,hair,tongue but human body and arms) Yes you would think that Athena uncle would to be to blame but Athena is a warrior goddess.