Why was Athena a virgin?

Why was Athena a virgin? Althought Athena is a virgin goddess, she mothered the god Erichthonios by Hephaestus. According to myth, she went to Hephaestus wanting some weapons forged. When Hephaestus tried to rape her, she protected her virginity and he ejaculated on her leg.

Althought Athena is a virgin goddess, she mothered the god Erichthonios by Hephaestus. According to myth, she went to Hephaestus wanting some weapons forged. When Hephaestus tried to rape her, she protected her virginity and he ejaculated on her leg.
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