About Medusa in Greek mythology?

Medusa was a beautiful woman. She was turned into a Gorgon by Athena because Medusa and Poseidon had an affair in Athena's temple. Having sexual affairs in a goddesses temple is extremely disrespectful. When Medusa was turned into a Gorgon, she became immortal. She was the extremely ugly and had snakes as hair. When anyone looked at her, they turned into stone. Later, Perseus, a hero, went on a quest to get Medusa's head. He could only use the reflection of his shield to look at her, or else he would turn to stone. Once the head is removed, it still has the power to turn people into stone.