Scott Bregman, 48, a Centennial School District math teacher, was arrested Wednesday. Police say he sent a photo of his genitals to a 17-year-old boy.
The incident happened at the B&R Fitness Club in Lower Southampton. Police say Bregman told the teen that he was a teacher at William Tennent High School and offered to tutor him.
Police say the teen was not one of Bregman's students. However, police say Bregman was aware of the teen's age and that he was a junior at another school, officials said.
The teen told police he had previous run-ins with Bregman at the club, and that Bregman made him feel "uncomfortable."
Bregman is charged with disseminating explicit sexual material to a minor and corruption of minors. If convicted, he could be sentenced to more than two years in prison.
He was arraigned and released on $30,000 bail.