Marion County Jail records show the 43-year-old Onorato was charged Friday with two counts of transmitting harmful material to minors. She posted bond early Saturday morning.
Onorato declined to comment when reached by phone by The Associated Press. Jail records do not list an attorney.
A police statement says a report was made to the police department on Monday alleging that Onorato, an employee at Vanguard High School, had sent nude pictures of herself to two students by text message. One student was a minor at the time.
When questioned by police, Onorato acknowledged sending numerous photos to the students "for attention." She also told detectives she apologized to the mothers of the students.