April Alexander, 26, biology teacher, MacArthur High School, Irving TX

April St. John Alexander, a former biology teacher at MacArthur High in Irving, was charged with one count of inappropriate relationship between student and teacher after police say she had sex with a male student more than 20 times during a three-month period. They allegedly got busy at the school and in her car. According to Irving police, Alexander resigned from the school in November of 2010.