Timothy Moll, a 25-year-old teacher at Dieruff High School in Allentown, Pennsylvania, is accused of offering good grades in exchange for a student's nude photos, WFMZ-TV reports.
Authorities told the station that Moll sent text messages to the 16-year-old student, asking for naked photos, promising extra points to her class grade if she complied.
Court documents obtained by the Express-Times reveal he also asked the student to text him about sex and sexual postions, allotting extra grade points if he was "turned on."
An investigation began in January after the unnamed student was punished for using a cell phone in class. The paper reports that school officials were then alerted to the possibly sexual messages between the student and teacher, leading authorities to track down both of their numbers.
NBC Philadelphia reports that Moll has been put on administrative leave after being charged Wednesday with corruption of a minor and unlawful contact with a minor. He has since been released on $20,000 bond and is scheduled for a preliminary hearing on April 13.
CORRECTION: An earlier version of this article incorrectly stated that Moll taught in Colorado.