A Londonderry high school teacher repeatedly offered to have sex with one of her students and also e-mailed nude photographs of herself that ended up circulating among students at the New Hampshire school, according to police.

Melinda Dennehy, 41, is charged with one count of indecent exposure for allegedly e-mailing the nude photograph of herself to a 15-year-old student, according to a police affidavit released today.

Earlier this week, staff at the school learned from students that “an inappropriate picture(s) of a female teacher were being distributed throughout the high school by the students,” the affidavit says.”This picture has been identified by co-workers to be that of Melinda Dennehy.”

According to the affidavit, Dennehy also e-mailed four photographs of herself to a student within the past two months. Dennehy allegedly also sent text messages to the same teen. “In some of those messages, Dennehy told (the teenager) that she wanted” to perform a sex act on him, police said in the affidavit.

Dennehy has been charged with one count of indecent exposure. She is free on $10,000 personal recognizance bail and is due to be arraigned in Derry District Court on April 30, police said.

Police said their investigation is continuing. A call to the Londonderry school superintendent was not immediately returned.