What is a "perverse madonna"? In the short story "The Boarding House" by James Joyce, Polly is compared to a "perverse madonna".
Polly was a slim girl of nineteen; she had light soft hair and a small full mouth. Her eyes, which were grey with a shade of green through them, had a habit of glancing upwards when she spoke with anyone, which made her look like a little perverse madonna. Mrs. Mooney had first sent her daughter to be a typist in a corn-factor's office but, as a disreputable sheriff's man used to come every other day to the office, asking to be allowed to say a word to his daughter, she had taken her daughter home again and set her to do housework.
What does this mean?