There is no prostitute called Mary in the Gospels. There was a conflation of three women:

- Mary Magdalene who had 7 devils cast out of her

- Mary of Bethany who anointed Christ with oil close to his crucifixion

- Unnamed woman who anointed Christ with oil and tears in the home of Simon

Not only are these three woman separate and distinct, none of them are even explicitly called out as prostitutes. So they both conflated their stories and assumed what the sin was.

Other Marys in the Gospels:

- Mary the mother of Christ

- Mary the mother of James

- Mary of Clopas