Sex Ed.

A 43-year-old former math teacher at Council Rock High School South in Bucks County has been charged with endangering the welfare of a child and corruption of a minor after he allegedly had a five-month sexual relationship with a 17-year-old student.

Robert C. Hawkins, of the 1800 block of Society Place in Newtown, Bucks County, turned himself in this morning to police and was arraigned, authorities said. He was released after posting bail, 10 percent of $500,000. His bail conditions say that he is not to have contact with the girl or any other minors and must stay away from all Council Rock schools.

The district fired Hawkins after the girl contacted police in late June. The girl's name was not released because of the nature of the crime.

According to a police affidavit, Hawkins and the girl began talking and text-messaging each other in November, with Hawkins initiating the conversations.

More than 6,000 messages were exchanged, police said, including messages from Hawkins saying he had checked to find out the age of consent for sexual relations. The two engaged in sex numerous times at Hawkins' home, from December to April, the affidavit said.