Section 57. In any prosecution or juvenile delinquency proceeding of a person who is a human trafficking victim, as defined by section 20M of chapter 233, it shall be an affirmative defense to charges of engaging in common night walking or common streetwalking in violation of section 53 of chapter 272 and to charges of violating section 26 or 53A of said chapter 272 that, while a human trafficking victim, such person was under duress or coerced into committing the offenses for which such person is being prosecuted or against whom juvenile delinquency proceedings have commenced.