How do we know Cinderella is a virgin?
Because she runs away from balls.
Cinderella's Virginity
Explanation
Explain Bear
Alright, listen up, buttercup. This joke is playing on two meanings of "balls." One is the fancy dance party, and the other is, well, the male reproductive organs. Cinderella is running away from balls, meaning she ain't gettin' any action. Get it now, genius?